• WordNet 3.6
    • n half-moon the crescent-shaped area at the base of the human fingernail
    • n half-moon the time at which the Moon is at first or last quarter when half its face is illuminated
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: If you fold a piece of A4 paper in half 44 times it will reach the moon
    • Half-moon (Zoöl) A marine, sparoid, food fish of California (Cæsiosoma Californiense). The body is ovate, blackish above, blue or gray below. Called also medialuna.
    • Half-moon (Fort) An outwork composed of two faces, forming a salient angle whose gorge resembles a half-moon; -- now called a ravelin.
    • Half-moon The moon at the quarters, when half its disk appears illuminated.
    • Half-moon The shape of a half-moon; a crescent. "See how in warlike muster they appear,
      In rhombs, and wedges, and half-moons , and wings."
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: The lunula is the half-moon shaped pale area at the bottom of finger nails.
    • n half-moon The moon at the quarters, when half its disk appears illuminated.
    • n half-moon Something in the shape of a half-moon, or, loosely, of a crescent.
    • n half-moon In fortification, an outwork composed of two faces forming a salient angle whose gorge is in the form of a crescent or a half-moon.
    • n half-moon In mining, a scaffold in a shaft, having a plan of nearly the shape of a half-moon. Such a construction is of a temporary character, and intended to afford a place where the men may stand while making repairs in the shaft. [Eng.]
    • n half-moon A species of rudder-fish, Medialuna californiensis, found on the coast of southern California.
    • ***
Chambers's Twentieth Century Dictionary
    • Half-moon the moon at the quarters when but half of it is illuminated: anything semicircular
    • ***


Chambers's Twentieth Century Dictionary
A.S. healf (Ger. halb, Dan. halv); original meaning 'side.'


In literature:

Reduits, half-moons, horn-works, and such close ways.
"The Works of Christopher Marlowe, Vol. 3 (of 3)" by Christopher Marlowe
And after all it was not so dark; for the moon happened to be more than half full, and being nearly overhead, shone down nicely.
"Chums in Dixie" by St. George Rathborne
Suppose we start in half an hour hence, we shall just have the moon to count the guilders by.
"The Phantom Ship" by Frederick Marryat
It was a beautiful calm night, and a half moon hung silver in the sky.
"The Princess of the School" by Angela Brazil
Besides, the moon will be lower in half an hour, and that will favour your enterprise.
"The Pirate City" by R.M. Ballantyne
In half an hour the moon rose in a clear sky.
"Red Rooney" by R.M. Ballantyne
The company seemed to think him moon-struck to ask such a question, but one of them replied that the moon was due in half an hour.
"Charlie to the Rescue" by R.M. Ballantyne
Under the low cliffs by the sea was a small half-moon of beach about 100 by 40 yards.
"Gallipoli Diary, Volume 2" by Ian Hamilton
And by the light of the moon as it emerged from behind a cloud the king saw the white and liquid radiance of her half-closed eyes.
"Balthasar" by Anatole France
It was a night as soft as silk; the water smooth, in long, faint, olive swells; a half-moon in the sky.
"The Long Roll" by Mary Johnston

In poetry:

The night is damp and warm and still,
And soft with summer dreams;
The buds are bursting at their will,
And shy the half moon gleams.
"Songs of the Spring Nights" by George MacDonald
The moon it struggled to see her pass
Through its half-lit veils of driving gray;
But moonbeams were slower than the steed
That Edith rode away.
"A Ballad Of The Mist" by Rose Hawthorne Lathrop
Erle Percy there his ancyent spred,
The Halfe-Moone shining all soe faire:
The Nortons ancyent had the crosse,
And the five wounds our Lord did beare.
"The Rising In The North" by Anonymous British
A strip of water's spread in the setting sun,
Half the river's emerald, half is red.
I love the third night of the ninth month,
The dew is like pearl; the moon like a bow.
"Song of Sunset on the River" by Bai JuYi
Current's surround me, and drowsily swaying,
Far on the moon-path I seek the sweet face.
Eagerly, hasting, half panting, half praying,
Forward I reach for the vision of grace.
"The Bride Of The Sea" by Howard Phillips Lovecraft
Take all that's mine "beneath the moon,"
If I with her but half a noon
May sit beneath the walls
Of some old cave, or mossy nook,
When up she winds along the brook
To hunt the waterfalls.
"Louisa: After Accompanying Her On A Mountain Excursion" by William Wordsworth

In news:

HALF MOON BAY, CA — GoPro ( www.gopro.com ) teamed up with Tim and Callum Macmillan of Time-Slice Films to create a new video for Rip Curl .
In fact, due to ideal weather in the second half of the new moon week, I expect this feeding migration period to strengthen all the way to next Monday, when a weather change is forecasted to bring rain for Tuesday.
This one is Half Moon Orchard Gin , due out in August.
A Gonzales woman who went missing last Thursday was found safe in Half Moon Bay.
Irene Cantu, 55, was found walking in Half Moon Bay on Wednesday morning, family members said.
Election night brought a pleasant reversal of fortune for the counties of San Mateo and Santa Clara and the city of Half Moon Bay, each of which passed sales tax hikes after previous tax proposals were rejected by voters.
Bob Marsh looks over his pumpkin farm on Highway 1 outside Half Moon Bay.
Lorenzo Bianchi (middle left), four years old, and Delfina Bianchi (left), 7 years old, by their grandfather's pumpkins in Half Moon Bay, Calif, on Monday, October 8, 2012.
Pilot killed after plane crashes in Half Moon Bay Crash kills 75-year-old Andrew Hayden of Florida.
Plane wreckage found near Half Moon Bay Airport.
The wreckage of an experimental plane that went down shortly after taking off from the Half Moon Bay Airport was found Tuesday.
An experimental plane went down shortly after takeoff from the Half Moon Bay Airport and is still missing.
42nd Art and Pumpkin Festival in Half Moon Bay.
The Half Moon is looking for volunteers to train in sail handling and ship operations.
I was driving down to Duluth this morning from Eveleth and as I passed Half-Moon lake off of Hwy 53, I had to turn around and capture the beautiful scene.

In science:

The VERITAS prototype camera consisted of 255 Hamamatsu PMTs in a ‘half-moon’ configuration.
An Overview of The VERITAS Prototype Telescope And Camera
There is an important term with half of the synodic period that depends on the product of G and mass, M , of the Earth-Moon system.
Improving LLR Tests of Gravitational Theory
Solar tides on the Moon (∼ 2 mm) occur at half the synodic period.
Improving LLR Tests of Gravitational Theory
Half amplitude of the Rossiter-McLaughlin effect due to Ganymede-sized moons of planets orbiting G, K and M dwarfs.
Methods for exomoon characterisation: combining transit photometry and the Rossiter-McLaughlin effect
The limb beams receive less thermal radiation from the Moon than the half-limb beam, resulting in a lower system temperature Tsys and greater sensitivity to radio pulses.
LUNASKA neutrino search with the Parkes and ATCA telescopes