The Collaborative International Dictionary of English v.0.48:

Bovine \Bo"vine\, a. [LL. bovinus, fr. L. bos, bovis, ox, cow:
   cf. F. bovine. See Cow.]
   [1913 Webster]
   1. (Zool.) Of or pertaining to the genus Bos; relating to,
      or resembling, the ox or cow; oxlike; as, the bovine
      genus; a bovine antelope.
      [1913 Webster]

   2. Having qualities characteristic of oxen or cows; sluggish
      and patient; dull; as, a bovine temperament.
      [1913 Webster]

            The bovine gaze of gaping rustics.    --W. Black.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bovine
    adj 1: of or relating to or belonging to the genus Bos (cattle)
           [syn: bovine, bovid]
    2: dull and slow-moving and stolid; like an ox; "showed a bovine
       apathy"
    n 1: any of various members of the genus Bos

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "bovine":
   Boeotian, Brahman, Indian buffalo, asinine, aurochs, beef,
   beef cattle, beef-brained, beef-witted, beeves, bison, blockish,
   bossy, bovid, bovine animal, buffalo, bull, bullock, calf, caprid,
   caprine, carabao, cattle, chumpish, cloddish, complacent, cow,
   cowish, cowlike, crass, critter, dairy cattle, dairy cow, deerlike,
   dense, dispassionate, dogie, doltish, dull, dullard, dumb,
   duncical, duncish, equestrian, equine, even-tempered, fat, goatish,
   goatlike, gross, heifer, hircine, hoggish, hoofed, hornless cow,
   horsy, impassive, imperturbable, ineducable, inexcitable,
   inirritable, kine, klutzy, leppy, lumpish, maverick, milch cow,
   milcher, milk cow, milker, muley cow, muley head, mulish, musk-ox,
   neat, oafish, opaque, ovine, ox, oxen, patient, piggish, ruminant,
   self-complacent, self-content, self-contented, self-satisfied,
   sheepish, sheeplike, smug, sottish, steady, steer, stirk, stoic,
   stolid, stot, stupid, swinish, thick, undisturbable, unflappable,
   ungulate, unirritable, unnervous, unpassionate, unteachable,
   wisent, wrongheaded, yak, yearling, zebu