The Collaborative International Dictionary of English v.0.48:

Goat \Goat\ (g[=o]t), n. [OE goot, got, gat, AS. g[=a]t; akin to
   D. geit, OHG. geiz, G. geiss, Icel. geit, Sw. get, Dan. ged,
   Goth. gaits, L. haedus a young goat, kid.] (Zool.)
   A hollow-horned ruminant of the genus Capra, of several
   species and varieties, esp. the domestic goat (Capra
   hircus), which is raised for its milk, flesh, and skin.
   [1913 Webster]

   Note: The Cashmere and Angora varieties of the goat have
         long, silky hair, used in the manufacture of textile
         fabrics. The wild or bezoar goat (Capra [ae]gagrus),
         of Asia Minor, noted for the bezoar stones found in its
         stomach, is supposed to be one of the ancestral species
         of the domestic goat. The Rocky Mountain goat
         (Haplocercus montanus) is more nearly related to the
         antelopes. See Mazame.
         [1913 Webster]

   Goat antelope (Zool), one of several species of antelopes,
      which in some respects resemble a goat, having recurved
      horns, a stout body, large hoofs, and a short, flat tail,
      as the goral, thar, mazame, and chikara.

   Goat fig (Bot.), the wild fig.

   Goat house.
   (a) A place for keeping goats.
   (b) A brothel. [Obs.]

   Goat moth (Zool.), any moth of the genus Cossus, esp. the
      large European species (Cossus ligniperda), the larva of
      which burrows in oak and willow trees, and requires three
      years to mature. It exhales an odor like that of the
      he-goat.

   Goat weed (Bot.), a scrophulariaceous plant, of the genus
      Capraria (Capraria biflora).

   Goat's bane (Bot.), a poisonous plant (Aconitum
      Lucoctonum), bearing pale yellow flowers, introduced from
      Switzerland into England; wolfsbane.

   Goat's foot (Bot.), a kind of wood sorrel (Oxalis
      caprina) growing at the Cape of Good Hope.

   Goat's rue (Bot.), a leguminous plant (Galega officinalis
      of Europe, or Tephrosia Virginiana in the United
      States).

   Goat's thorn (Bot.), a thorny leguminous plant (Astragalus
      Tragacanthus), found in the Levant.

   Goat's wheat (Bot.), the genus Tragopyrum (now referred
      to Atraphaxis).
      [1913 Webster]

WordNet (r) 3.0 (2006):

goat
    n 1: any of numerous agile ruminants related to sheep but having
         a beard and straight horns [syn: goat, caprine animal]
    2: a victim of ridicule or pranks [syn: butt, goat,
       laughingstock, stooge]
    3: (astrology) a person who is born while the sun is in
       Capricorn [syn: Capricorn, Goat]
    4: the tenth sign of the zodiac; the sun is in this sign from
       about December 22 to January 19 [syn: Capricorn, Capricorn
       the Goat, Goat]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "goat":
   Priapus, aphrodisiomaniac, balker, balky horse, billy, billy goat,
   broad jumper, buck, bucking bronco, buckjumper, butt, byword,
   byword of reproach, crock, crowbait, derision, dirty old man, doe,
   doeling, dog, dupe, eroticomaniac, erotomaniac, fair game,
   fall guy, figure of fun, flea, fool, frog, game, garron, gazelle,
   gazingstock, grasshopper, gynecomaniac, hack, he-goat, high jumper,
   hopper, hurdle racer, hurdler, jackrabbit, jade, jest,
   jestingstock, joke, jughead, jumper, jumping bean, jumping jack,
   kangaroo, kid, laughingstock, leaper, lecher, mockery, monkey,
   mountain goat, nag, nanny, nanny goat, old goat, patsy, plug,
   pole vaulter, roarer, rogue, rosinante, salmon, satyr, scalawag,
   scapegoat, she-goat, stag, stiff, stock, sunfisher, target,
   timber topper, toy, vaulter, victim, whipping boy, whistler,
   whoremaster, whoremonger



The Jargon File (version 4.4.7, 29 Dec 2003):

GoAT
 //

    [Usenet] Abbreviation: ?Go Away, Troll?. See troll.


Easton's 1897 Bible Dictionary:

Goat
   (1.) Heb. 'ez, the she-goat (Gen. 15:9; 30:35; 31:38). This
   Hebrew word is also used for the he-goat (Ex. 12:5; Lev. 4:23;
   Num. 28:15), and to denote a kid (Gen. 38:17, 20). Hence it may
   be regarded as the generic name of the animal as domesticated.
   It literally means "strength," and points to the superior
   strength of the goat as compared with the sheep.

     (2.) Heb. 'attud, only in plural; rendered "rams" (Gen.
   31:10,12); he-goats (Num. 7:17-88; Isa. 1:11); goats (Deut.
   32:14; Ps. 50:13). They were used in sacrifice (Ps. 66:15). This
   word is used metaphorically for princes or chiefs in Isa. 14:9,
   and in Zech. 10:3 as leaders. (Comp. Jer. 50:8.)

     (3.) Heb. gedi, properly a kid. Its flesh was a delicacy among
   the Hebrews (Gen. 27:9, 14, 17; Judg. 6:19).

     (4.) Heb. sa'ir, meaning the "shaggy," a hairy goat, a he-goat
   (2 Chr. 29:23); "a goat" (Lev. 4:24); "satyr" (Isa. 13:21);
   "devils" (Lev. 17:7). It is the goat of the sin-offering (Lev.
   9:3, 15; 10:16).

     (5.) Heb. tsaphir, a he-goat of the goats (2 Chr. 29:21). In
   Dan. 8:5, 8 it is used as a symbol of the Macedonian empire.

     (6.) Heb. tayish, a "striker" or "butter," rendered "he-goat"
   (Gen. 30:35; 32:14).

     (7.) Heb. 'azazel (q.v.), the "scapegoat" (Lev. 16:8, 10,26).

     (8.) There are two Hebrew words used to denote the
   undomesticated goat:, _Yael_, only in plural mountain goats (1
   Sam. 24:2; Job 39:1; Ps.104:18). It is derived from a word
   meaning "to climb." It is the ibex, which abounded in the
   mountainous parts of Moab. And _'akko_, only in Deut. 14:5, the
   wild goat.

     Goats are mentioned in the New Testament in Matt. 25:32,33;
   Heb. 9:12,13, 19; 10:4. They represent oppressors and wicked men
   (Ezek. 34:17; 39:18; Matt. 25:33).

     Several varieties of the goat were familiar to the Hebrews.
   They had an important place in their rural economy on account of
   the milk they afforded and the excellency of the flesh of the
   kid. They formed an important part of pastoral wealth (Gen.
   31:10, 12;32:14; 1 Sam. 25:2).