Source : Webster's Revised Unabridged Dictionary (1913)

Cyprinodont \Cy*prin"o*dont\ (s?-pr?n"?-d?nt), n. [Gr. ???? kind
   of carp + ????, ????, a tooth.] (Zo["o]l.)
   One of the {Cyprinodontidae}, a family of fishes including
   the killifishes or minnows. See {Minnow}.

Source : WordNet®

cyprinodont
     n : any member of the family Cyprinodontidae