The Collaborative International Dictionary of English v.0.48:

Cow \Cow\, n.; pl. Cows (kouz); old pl. Kine (k[imac]n).
   [OE. cu, cou, AS. c[=u]; akin to D. koe, G. kuh, OHG. kuo,
   Icel. k[=y]r, Dan. & Sw. ko, L. bos ox, cow, Gr. boy^s, Skr.
   g[=o]. [root]223. Cf. Beef, Bovine, Bucolic, Butter,
   Nylghau.]
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   1. The mature female of bovine animals.
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   2. The female of certain large mammals, as whales, seals,
      etc.
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The Collaborative International Dictionary of English v.0.48:

Cow \Cow\ (kou), n. [See Cowl a hood.]
   A chimney cap; a cowl
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The Collaborative International Dictionary of English v.0.48:

Cow \Cow\, v. t. [imp. & p. p. Cowed (koud); p. pr. & vb. n.
   Cowing.] [Cf. Icel. kuga, Sw. kufva to check, subdue, Dan.
   kue. Cf. Cuff, v. t.]
   To depress with fear; to daunt the spirits or courage of; to
   overawe.
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         To vanquish a people already cowed.      --Shak.
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         THe French king was cowed.               --J. R. Green.
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The Collaborative International Dictionary of English v.0.48:

Cow \Cow\, n. [Prob. from same root as cow, v. t.] (Mining)
   A wedge, or brake, to check the motion of a machine or car; a
   chock. --Knight.
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WordNet (r) 3.0 (2006):

cow
    n 1: female of domestic cattle: "`moo-cow' is a child's term"
         [syn: cow, moo-cow]
    2: mature female of mammals of which the male is called `bull'
    3: a large unpleasant woman
    v 1: subdue, restrain, or overcome by affecting with a feeling
         of awe; frighten (as with threats) [syn: overawe, cow]