cock \cock\ ko^k, n. as. coc; of unknown origin, perh. in
   imitation of the cry of the cock. cf. chicken.
   1. the male of birds, particularly of gallinaceous or
      domestic fowls.
      1913 webster

   2. a vane in the shape of a cock; a weathercock.
      1913 webster

            drenched our steeples, drowned the cocks --shak.
      1913 webster

   3. a chief man; a leader or master. humorous
      1913 webster

            sir andrew is the cock of the club, since he left
            us.                                   --addison.
      1913 webster

   4. the crow of a cock, esp. the first crow in the morning;
      cockcrow. obs.
      1913 webster

            he begins at curfew, and walks till the first cock.
                                                  --shak.
      1913 webster

   5. a faucet or valve.
      1913 webster

   note: jonsons says, "the handle probably had a cock on the
         top; things that were contrived to turn seem anciently
         to have had that form, whatever was the reason."
         skinner says, because it used to be constructed in
         forma critae galli, i.e., in the form of a cock's
         comb.
         1913 webster

   6. the style of gnomon of a dial. --chambers.
      1913 webster

   7. the indicator of a balance. --johnson.
      1913 webster

   8. the bridge piece which affords a bearing for the pivot of
      a balance in a clock or watch. --knight.
      1913 webster

   9. a penis. vulgar
      pjc

   ball cock. see under ball.

   chaparral cock. see under chaparral.

   cock and bull story, an extravagant, boastful story; a
      canard.

   cock of the plains zool. see sage cock.

   cock of the rock zool., a south american bird rupicola
      aurantia having a beautiful crest.

   cock of the walk, a chief or master; the hero of the hour;
      one who has overcrowed, or got the better of, rivals or
      competitors.

   cock of the woods. see capercailzie.
      1913 webster
see also:
chicken ball cock ball chaparral cock chaparral cock and bull story 
an extravagant cock of the plains sage cock cock of the rock rupicola aurantia 
cock of the walk cock of the woods capercailzie