Definitions
1.NounAny of several aquatic snakes (none of which are true adders) including, among others:
A non-venomous European ringed snake or water snake (Natrix natrix).
A venomous American cottonmouth (Agkistrodon piscivorus).
A non-venomous American northern water snake (Nerodia sipedon)
A venomous South Asian crab-eating water snake (Fordonia leucobalia)
2.NounA non-venomous European ringed snake or water snake (Natrix natrix).
3.NounA venomous American cottonmouth (Agkistrodon piscivorus).
4.NounA non-venomous American northern water snake (Nerodia sipedon)
5.NounA venomous South Asian crab-eating water snake (Fordonia leucobalia)