nerodia sipedon

English Thesaurus

1. in some classifications placed in the genus Nerodia; western United States snake that seldom ventures far from water (noun.animal)

hypernym	:	water snake,
definition	:	any of various mostly harmless snakes that live in or near water (noun.animal)

member meronym	:	genus natrix, natrix,
definition	:	water snakes; a cosmopolitan genus (noun.animal)