• WordNet 3.6
    • n alum a double sulphate of aluminum and potassium that is used as an astringent (among other things)
    • n alum a person who has received a degree from a school (high school or college or university)
    • n alum a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
    • n alum a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
    • ***
Webster's Revised Unabridged Dictionary
    • n Alum (Chem) A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.☞ Common alum is the double sulphate of aluminium and potassium. It is white, transparent, very astringent, and crystallizes easily in octahedrons. The term is extended so as to include other double sulphates similar to alum in formula.
    • v. t Alum To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
    • ***
Century Dictionary and Cyclopedia
    • n alum The general name of a class of double sulphates formed by the union of aluminium, iron, chromium, or manganese sulphate with the sulphate of some other metal, commonly an alkaline metal or ammonium. Common or potash alum has the formula Al2(SO4)3 + K2SO4 + 24H2O. It is produced by mixing concentrated solutions of potassium sulphate and crude aluminium sulphate. The double salt at once crystallizes in octahedrons. Alum is soluble in water, has a sweetish-sour taste, reddens litmus, and is a powerful astringent. In medicine it is used internally as an astringent, externally as a styptic applied to severed blood-vessels. In the arts it is used as a mordant in dyeing, and extensively in other ways. When mixed in small amount with inferior grades of flour, it is said to whiten them in the process of bread-making, but its effect on the system is injurious.
    • alum To steep in or impregnate with a solution of alum.
    • ***
Chambers's Twentieth Century Dictionary
    • n Alum al′um a mineral salt, the double sulphate of alumina and potash, used as a mordant in dyeing and for many purposes
    • ***


Webster's Revised Unabridged Dictionary
OE. alum, alom, OF. alum, F. alun, fr. L. alumen, alum
Chambers's Twentieth Century Dictionary
L. alumen.


In literature:

A paste that will not spoil is made by dissolving a piece of alum the size of a walnut in one pint of water.
"Paper and Printing Recipes" by J. Sawtelle Ford
It was then taken out and placed in the alum solution like its fellow.
"The Galaxy, April, 1877" by Various
Alum is found in the western oases.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1" by Various
Free from Ammonia, Alum, or any other adulterant.
"Harper's Round Table, April 30, 1895" by Various
Free from Ammonia, Alum, or any other adulterant.
"Harper's Round Table, May 7, 1895" by Various
Some skins are prepared with alum only, and others with oak-bark liquor of the tanner's pits.
"Harper's Round Table, July 2, 1895" by Various
Alum is the base of pure clay, and strata of clay are often met with containing much iron pyrites.
"Principles of Geology" by Charles Lyell
Instead of alum various other salts, e.g.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6" by Various
It gives characteristic reactions with alum, basic lead acetate, and other common reagents.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
The cliffs at our encampment consisted of slate-clay, and bituminous alum-slate, and were six hundred feet high.
"Narrative of a Second Expedition to the Shores of the Polar Sea" by John Franklin

In poetry:

Oh, big was the bosom of brave ALUM BEY,
And also the region that under it lay,
In safety and peril remarkably cool,
And he dwelt on the banks of the river Stamboul.
"Brave Alum Bey" by William Schwenck Gilbert
Brave ALUM was picked up the very next day -
A man-o'-war sighted him smoking away;
With hunger and cold he was ready to drop,
So they sent him below and they gave him a chop.
"Brave Alum Bey" by William Schwenck Gilbert
The mast it went over, and so did the sails,
Brave ALUM threw over his casks and his bales;
The billows arose as the weather grew thick,
And all except ALUM were terribly sick.
"Brave Alum Bey" by William Schwenck Gilbert
But iron-rust and alum-spray
And chafing gear, and sun and dew
Vexed this lad and lassie gay,
Tears in their eyes, salt tears nor few;
And the hug relaxed with the failing glue.
"The Figure-Head" by Herman Melville
"O ALUM," said she, "think again, ere you go -
Hareems may arise and Moguls they may blow;
You may strike on a fez, or be drowned, which is wuss!"
But ALUM embraced her and spoke to her thus:
"Brave Alum Bey" by William Schwenck Gilbert
One day ALUM saw, with alarm in his breast,
A cloud on the nor-sow-sow-nor-sow-nor-west;
The wind it arose, and the crew gave a scream,
For they knew it - they knew it! - the dreaded Hareem!!
"Brave Alum Bey" by William Schwenck Gilbert

In news:

Dismissing pleas to delay a decision, the Alum Rock Union School Board on Monday appointed Andrea Flores Shelton to fill a vacant seat on the board.
NFL players with local ties, Week 11: Oregon alum Jairus Byrd turns in "the interception of the season".
'Idol' alum Reinhart reportedly splits with Interscope.
'American Idol' alum Haley Reinhart reportedly splits with Interscope.
Alum Rock school board picks ex-Shirakawa aide to fill vacancy.
Ignoring calls to delay an appointment, the Alum Rock Union School Board named Andrea Flores Shelton to fill a vacant seat on the board.
Auto City Speedway alum Brad Keselowski wins NASCAR Sprint Cup Series championship.
Scott Rotruck, Chesapeake vice president and WVU alum , happy to be part of Big 12.
Alum says she spotted sex offender at parish festival, urged priest to tell him to leave.
'90210' Gets a New Kid, 'Fringe' Alum Cast as 'Arrow' Big Bad.
Staff, students and administrators of Ionia High School are helping an alum and others feel closer to home while they serve a tour in Afghanistan.
TCU coach, K-State alum Patterson sees how good No.
FSHS alum to play in NJCAA volleyball tourney.
Each year they honor an alum who has made a strong impact in the hospitality industry.
Or the unexpected ability to touch an alum who then offers to help her pay for school.

In science:

IVIG given in immunogenic form, namely with an adjuvant such as alum, via an immunogenic route, for example intra-muscularly.
Recent Developments in Immune Network Theory including a concept for an HIV Vaccine