Source : Webster's Revised Unabridged Dictionary (1913)

Dyke \Dyke\, n.
   See {Dike}. The spelling dyke is restricted by some to the
   geological meaning.

Source : WordNet®

dyke
     n 1: offensive terms for a lesbian who is noticeably masculine
          [syn: {butch}, {dike}]
     2: a barrier constructed to contain the flow of water or to
        keep out the sea [syn: {dam}, {dike}, {levee}]
     v : enclose with a dike; "dike the land to protect it from
         water" [syn: {dike}]