Source : Webster's Revised Unabridged Dictionary (1913)

Cayman \Cay"man\ (k[=a]"man), n. [From the language of Guiana:
   cf. Sp. caiman.] (Zo["o]l.)
   The south America alligator. See {Alligator}. [Sometimes
   written {caiman}.]

Source : WordNet®

cayman
     n : an alligator-like reptile of Central America and South
         America having a more heavily armored belly [syn: {caiman}]