any small, soft-rayed fish of the order Cyprinodontes, of warm, fresh or brackish waters in North America, including the killifishes, topminnows, and guppies.
–adjective
2.
of, pertaining to, or resembling the cyprinodonts.
cy·prin·o·dont (sĭ-prĭn'ə-dŏnt', -prī'nə-) n. Any of various small soft-finned fishes of the family Cyprinodontidae, which includes the killifishes, topminnows, and many species popular in home aquariums. adj. Of, relating to, or belonging to the family Cyprinodontidae.