water adder

noun5

1. •
   A water mocassin (Agkistrodon piscivorus), a venomous aquatic snake of North America.
2. •
   Any of species Natrix natrix of non-venomous European snakes.
3. •
   Any aquatic snake.
4. •
   A northern water snake (Nerodia sipedon), a non-venomous American snake.
5. •
   A crab-eating water snake or white-bellied mangrove snake (Fordonia leucobalia), a venomous snake of south Asia.