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):

Galega officinalis
    n 1: tall bushy European perennial grown for its pinnate foliage
         and slender spikes of blue flowers; sometimes used
         medicinally [syn: goat's rue, goat rue, Galega
         officinalis]