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The Collaborative International Dictionary of English v.0.48 (gcide)

Moon \Moon\ (m[=oo]n), n. [OE. mone, AS. m[=o]na; akin to D.
maan, OS. & OHG. m[=a]no, G. mond, Icel. m[=a]ni, Dan. maane,
Sw. m[*a]ne, Goth. m[=e]na, Lith. men[*u], L. mensis month,
Gr. mh`nh moon, mh`n month, Skr. m[=a]s moon, month; prob.
from a root meaning to measure (cf. Skr. m[=a] to measure),
from its serving to measure the time. [root]271. Cf. {Mete}
to measure, {Menses}, {Monday}, {Month}.]
1. The celestial orb which revolves round the earth; the
satellite of the earth; a secondary planet, whose light,
borrowed from the sun, is reflected to the earth, and
serves to dispel the darkness of night. The diameter of
the moon is 2,160 miles, its mean distance from the earth
is 240,000 miles, and its mass is one eightieth that of
the earth. See {Lunar month}, under {Month}.
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The crescent moon, the diadem of night. --Cowper.
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2. A secondary planet, or satellite, revolving about any
member of the solar system; as, the moons of Jupiter or
Saturn.
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3. The time occupied by the moon in making one revolution in
her orbit; a month; as, it's been many moons since I last
visited Washington. --Shak.
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4. (Fort.) A crescentlike outwork. See {Half-moon}.
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5. The deliberately exposed naked buttocks. [slang]
[PJC]

{Moon blindness}.
(a) (Far.) A kind of ophthalmia liable to recur at
intervals of three or four weeks.
(b) (Med.) Hemeralopia.

{Moon dial}, a dial used to indicate time by moonlight.

{Moon face}, a round face like a full moon.

{Moon madness}, lunacy. [Poetic]

{Moon month}, a lunar month.

{Moon trefoil} (Bot.), a shrubby species of medic ({Medicago
arborea}). See {Medic}.

{Moon year}, a lunar year, consisting of lunar months, being
sometimes twelve and sometimes thirteen.

{blue moon}, see {blue moon} in the vocabulary.

{many moons}, a long time.
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Moon \Moon\, v. t. [imp. & p. p. {Mooned}; p. pr. & vb. n.
{Mooning}.]
1. To expose to the rays of the moon.
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If they have it to be exceeding white indeed, they
seethe it yet once more, after it hath been thus
sunned and mooned. --Holland.
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2. To expose one's naked buttocks to (a person); -- a vulgar
sign of contempt or disrespect, sometimes done as a prank.
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Moon \Moon\, v. i.
To act if moonstruck; to wander or gaze about in an
abstracted manner.
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Elsley was mooning down the river by himself. --C.
Kingsley.
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