• WordNet 3.6
    • n O the blood group whose red cells carry neither the A nor B antigens "people with type O blood are universal donors"
    • n O the 15th letter of the Roman alphabet
    • n o the 15th letter of the Roman alphabet
    • n O a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: O.J. Simpson had a severe case of rickets and wore leg braces when he was a child
    • O A cipher; zero. "Thou art an O without a figure."
    • O Among the ancients, O was a mark of triple time, from the notion that the ternary, or number 3, is the most perfect of numbers, and properly expressed by a circle, the most perfect figure.
    • interj O ō An exclamation used in calling or directly addressing a person or personified object; also, as an emotional or impassioned exclamation expressing pain, grief, surprise, desire, fear, etc.O is frequently followed by an ellipsis and that, an in expressing a wish: “OI wish] that Ishmael might live before thee!” Gen. xvii. 18; or in expressions of surprise, indignation, or regret: “Oit is sad] that such eyes should e'er meet other object!” "For ever, O Lord, thy word is settled in heaven.""O how love I thy law ! it is my meditation all the day.""O for a kindling touch from that pure flame!""But she is in her grave, -- and oh The difference to me!""Oh for a lodge in some vast wilderness!""We should distinguish between the sign of the vocative and the emotional interjection, writing O for the former, and oh for the latter."
    • O O, the fifteenth letter of the English alphabet, derives its form, value, and name from the Greek O, through the Latin. The letter came into the Greek from the Phœnician, which possibly derived it ultimately from the Egyptian. Etymologically, the letter o is most closely related to ae, and u; as in E. bone, AS. bān; E. stone, AS. stān; E. broke, AS. brecan to break; E. bore, AS. beran to bear; E. dove, AS. dūfe; E. toft, tuft; tone, tune; number, F. nombre.
    • a O ō One. "Alle thre but o God."
    • O Something shaped like the letter O; a circle or oval. "This wooden O Globe Theater"
    • O The letter O, or its sound. "Mouthing out his hollow oes and aes."
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Ed Cox from San Francisco invented the pot scrubbing S.O.S. pads in 1917. His wife came up with the name, which stands for "Save Our Saucepans."
    • o The fifteenth letter and fourth vowel in our alphabet. It followed N also in the Italican systems, but was separated from it in Greek and Phenician by another character, which in the latter had the value of a sibilant, and in the former that of the compound ks (ξ). The O-character, accordingly, was the sixteenth in the Phenician alphabet, and it represented there the 'ain. a very peculiar and to us unpronounceable guttural; the Greeks (as in the case of E: see that letter) arbitrarily changed its value to that of a vowel, corresponding in quality to our “long ō.” There is no traceable Egyptian prototype for the character; the comparison of older forms is therefore as follows:
    • o It thus appears that the belief, not uncommonly held, that O represents, and is imitated from, the rounded position of the lips in its utterance, is a delusion. The historical value of the letter (as already noticed) is that of our o, in note, etc., whether of both long and short quantities, as in Latin and the earliest Greek, or of short only, as in Greek after the addition to that alphabet of a special sign for long o (namely omega, Ω, ω). This vowel-sound, the name-sound of o, is found in English usage only with long quantity in accented syllables. There is no closely corresponding short vowel in standard English, but only in dialectal pronunciation, as in the New England utterance of certain words (much varying in number in different individuals): for example, home, whole, none. What we call “short o” (in not, on, etc.) is a sound of altogether different quality, very near to a true short ä (that is, a short utterance corresponding to the a of arm, father), but verging slightly toward the “broad” a (â) or o (ô) of laud, lord. “Short o” has a marked tendency to take on a “broader” sound, especially before r, and especially in America: hence the use, in the respellings of this work, of ô, which varies in different mouths from the full sound of â to that of ŏ. After these three values of the character, the next most common one is that of the oo-sonnd, the original and proper sound of u (represented in this work by ö), as in move, with the nearly corresponding short sound (marked u) in a few words, as wolf, woman. All these vowel-sounds partake of what is usually called a “labial” or a “rounded” character: that is to say, there is involved in their utterance a rounding and closing movement of the lips (and, it is held, of the whole mouth-cavity), in different degrees — least of all in ŏ, more and more in â, ō, u, ö; in the last, carried to its extreme, no closer rounding and approximation being possible. The labial action helps to give the vowel-sounds in question their fully distinctive character; but it can be more or less slighted without leaving them unrecognizable, and, in the generally indifferent habit of English pronunciation, is in a degree neglected, even in accented syllables, and yet more in unaccented. Our “long ō,” it should be added, regularly ends with a vanishing sound of oo (ö), as our ā with one of ē. O also has in many words the value of the “neutral” vowels of hut, hurt: for example, in son, come, love, work. O is further a member of several very common and important digraphs: thus, oo, the most marked representative of the ö-sound (in moon, rood, etc.), but also pronounced as u (book, look, etc.) and ŭ (blood, etc.); ou (in certain situations ow), oftenest representing a real diphthong (in out, sound, now, etc.), but also a variety of other sounds (as in through, could, ought, rough); oi (in certain situations oy), standing for a real diphthongal sound of which the first element is the “broad” o- or a-sound (for example, point, boy); oa (load, etc.), having the “long” o-sound; others, as eo (variously pronounced, as in people, yeoman, jeopard), oe (in foe, does, etc.), are comparatively rare.
    • o As a medieval Roman numeral, 11.
    • o As a symbol: In medieval musical notation, the sign of the tempus perfectum — that is, of triple rhythm. See mensurable music, under mensurable.
    • o In modern musical notation, a null (which see)
    • o In chem., the symbol of oxygen.
    • o In logic, the symbol of the particular negative proposition. See A, 2 .
    • o An abbreviation: Of old: as, in O. H. G., Old High German; O. T., Old Testament.
    • o Of the Middle Latin octavius, a pint.
    • o [lowercase] In a ship's log-book, of overcast.
    • o Pl. o's, oes (ōz). Anything circular or approximately so, as resembling the shape of the letter o, as a spangle, the circle of a theater, the earth, etc.
    • o An arithmetical cipher; zero: so called from its form.
    • o A common interjection expressing surprise, pain, gladness, appeal, entreaty, invocation, lament, etc., according to the manner of utterance and the circumstances of the case.
    • n o An exclamation or lamentation.
    • n o Same as ho.
    • o An abbreviated form of on. Commonly written o'.
    • o Same as one.
    • o Same as a, the indefinite article.
    • o An abbreviated form of of, now commonly written o'. It is very common in colloquial speech, but is usually written and printed in the full form of. It is the established form of of in the phrase o'clock. See clock.
    • o A prefix common in Irish surnames, equivalent to Mac-in Gaelic and Irish surnames (see Mac), meaning ‘son,’ as in O'Brien, O'Connor, O'Donnell, O'Sullivan, son of Brien, Connor, Donnell, etc.
    • o The usual “connecting vowel,” properly the stem-vowel of the first element, of compound words taken or formed from the Greek, as in acr-o-lith, chrys-o-prase, mon-o-tone, prot-o-martyr, etc. This vowel -o- is often accented, becoming then, as in -o-logy, -o-graphy, etc., an apparent part of the second element. (See -ology.) So in -oid, properly -o-id, it has become apparently a part of the suffix. See -i-2.
    • o An abbreviation
    • o in electricity, of ohm;
    • o of Ohio;
    • o of only;
    • o of opening of the circuit;
    • o in psychology, of observer.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: Chopsticks are called "o-hashi" in Japan and "kwai-tse" in China.
    • O the fifteenth letter and fourth vowel of our alphabet, its sound intermediate between a and u—with three values in English, the name-sound heard in note, the shorter sound heard in not, and the neutral vowel heard in son: as a numeral, 'nothing,' or 'zero' (formerly O=11, and (Ō)=11,000): (chem.) the symbol of oxygen: anything round or nearly so (pl. O's, Oes, pron. ōz).
    • interj O ō an exclamation of wonder, pain, desire, fear, &c. The form oh is the more usual in prose.—O hone! Och hone! an Irish exclamation of lamentation.
    • O usually written o', an abbrev. for of and on.
    • ***


  • Walter Savage Landor
    “O what a thing is age! Death without death's quiet.”
  • William Cowper
    “O, popular applause! what heart of man is proof against thy sweet, seducing charms?”
  • William Shakespeare
    “O, had I but followed the arts!”
  • Virginia Woolf
    “Against you I will fling myself, unvanquished and unyielding, O Death!”
  • Socrates
    “I pray Thee, O God, that I may be beautiful within.”
  • William Shakespeare
    “O world, how apt the poor are to be proud!”


Five o'clock shadow - A five o'clock shadow is the facial hair that a man gets if he doesn't shave for a day or two.
Will-o'-the-wisp - Something that deceives by its appearance is a will-o’-the-wisp; it looks good, but turns out to be a disappointment.


Webster's Revised Unabridged Dictionary
See One


In literature:

But when we got home H.O.
"New Treasure Seekers" by E. (Edith) Nesbit
The N.C.O., L.-C. Cowen, remained at Eve O.P.
"Q.6.a and Other places" by Francis Buckley
Beyond the O'Meara dwelling and on the same side of the street, stretches a row of cottages, built and owned by Mr. O'Meara.
"The Diamond Coterie" by Lawrence L. Lynch
Most o' toimes folk is na apt to be fond o' such loike as this little un o' hers.
"That Lass O' Lowrie's" by Frances Hodgson Burnett
You should be glad o' the chance to tell him o't.
"The House with the Green Shutters" by George Douglas Brown
That's a big sin for a little boy to carry on his conscience, Tim O'Neill.
"Grey Town" by Gerald Baldwin
He married out o' the likes o' us, as 'twas.
"A Poor Man's House" by Stephen Sydney Reynolds
A fool is happier thinking weel o' himself, than a wise man is o' others thinking weel o' him.
"The Proverbs of Scotland" by Alexander Hislop
O'Connell and the O'Gorman were very chatty.
"Diaries of Sir Moses and Lady Montefiore, Volume I" by Sir Moses Montefiore
Miss O'Day has infringed upon this rule.
"Elizabeth Hobart at Exeter Hall" by Jean K. Baird

In poetry:

"O wha is this has done this deed,
And tauld the king o' me;
To send us out this time o' the year,
To sail upon the sea?
"Sir Patrick Spens" by Henry Morley
Gien a body could be a thoucht o' grace,
And no a sel ava!
I'm sick o' my heid and my ban's and my face,
O' my thouchts and mysel and a';
"O Lassie Ayont The Hill!" by George MacDonald
O hope and faith!
O aching close of exiled patriots' lives!
O many a sicken'd heart!
Turn back unto this day, and make yourselves afresh.
"Europe, The 72d And 73d Years Of These States" by Walt Whitman
"O open the door, Love Gregor," she says,
"O open, and let me in;
For the wind blaws thro' my yellow hair,
And the rain draps o'er my chin."
"Love Gregor; Or, The Lass Of Lochroyan" by Andrew Lang
"I faun' that if even a brither o' mine
Had come to help me there,
The sin o' his bluid wad been on my heid,
For the sake o' gettin' his share.
"The Piper's Tree" by Alexander Anderson
"O, little wee man, but ye hae power!
And O, where may your dwelling be?"--
"I dwell beneath yon bonny bower.
O, will ye gae wi' me and see?"--
"The Little Wee Man" by Henry Morley

In news:

As the summer of G.O.O.D.
Jack-o-lantern sandwiches, carrot "fingers" with dipping "blood" and mini jack-o-lanterns made from oranges are healthy alternatives to the excess of Halloween sugar.
Bill Cosby was one who helped make Jell -O Pudding a household name, but Jell -O has always billed it's delicious temptations as treats designed specifically for adults.
Join Martha Manikas-Foster for this look at Jell-O and the Jell-O Gallery at the LeRoy Historical Society.
Parents of the couple are Jerry & Connie Thede of Reinbeck and Mike O'Rear and the late Monica O'Rear of DuBois, ILL.
"If they hold the line at midnight and someone opens at 10 o'clock or 8 o'clock, that's where shoppers will take their money.".
Willow O'Leary, 10, a fourth-grader at Farwell Elementary School in Lewiston, looks over the book selection with her father, Christopher O'Leary, during the school's Family Fun Night on Thursday.
Don and Marty had "Coffee With" Lucille O'Neal, mom of basketball star Shaq O'Neal.
1 sugar free pack lime Jell-O instant Jell-O.
This live concert from Nashville includes such classic Christmas songs as "O Come, O Come Emmanuel," "God Rest Ye Merry Gentlemen," "Hark".
12 O'Clock Track / Music 12 O'Clock Track: Ty Segall & Dillon Watson, "Needles in the Camel's Eye".
12 O'Clock Track / Music 12 O'Clock Track: Bruce Springsteen & the E Street Band featuring Eddie Vedder, "Atlantic City".
O'Connor will become the principal of both St Mary's and Archbishop O'Hara high schools this fall, splitting his time evenly between the two facilities.
O'Neill, O'Donnell, Kennedy lead in Supreme Court race #vindyvote.
Montana State Legislator Jerry O'Neil has officially asked the State of Montana to pay him in gold and silver via a letter mailed by O'Neil early this week.

In science:

The U (N ) norm (in the m-particle spaces) of an operator O is defined by ||O||m = qh(O − hOim )†(O − hOim )im .
Structure of wavefunctions in (1+2)-body random matrix ensembles
For each orientated graph (Γ, O) they associate two Riemann surfaces, S O (Γ, O) a finite area noncompact surface, and S C (Γ, O) a compact surface.
On the Genus of a Random Riemann Surface
O(ǫ), pI = O(ǫ), sI = O(ǫ), gI = g + O(ǫ) (where ǫ is some small parameter).
Marginal Deformations of N=4 SYM and of its Supersymmetric Orbifold Descendants
Hence q13 ((O≤y′ × U w ) ∩ (X × O≤y )) ⊂ O≤y′′ because O≤y′ and O≤y′′ are preserved by the diagonal action of U − and ˙W .
Induced and simple modules of double affine Hecke algebras
The observable O, belonging to some space O, can be expressed in terms of the Hamiltonian eigenbasis {|ω i} as: O = Z O(ω ) |ω ) dω + Z Z O(ω , ω ′ ) |ω ; ω ′ ) dω dω ′ where |ω ) = |ω ihω |, |ω ; ω ′) = |ω ihω ′ |, and O(ω , ω ′ ) are regular functions such that the Riemann-Lebesgue theorem can be applied in eq.(5) .
The cosmological origin of time-asymmetry