1) Genus natrix 2) Reptile genus 3) Water snakes 
Natrix is a genus of colubrid snakes. There are three or four species in the genus. They are collectively called grass snakes and water snakes. However, some other snake species known as `grass snakes` and `water snakes` are not of the genus Natrix. Genus includes: ...
[n] - water snakes
genus Natrix noun water snakes; a cosmopolitan genus