'Sea snake' definitions:
Definition of 'sea snake'
(from WordNet)
noun
Any of numerous venomous aquatic viviparous snakes having a fin-like tail; of warm littoral seas; feed on fish which they immobilize with quick-acting venom
Definition of 'Sea snake'
From: GCIDE
- Sea snake \Sea" snake`\ (Zool.) Any one of many species of venomous aquatic snakes of the family Hydrophidae, having a flattened tail and living entirely in the sea, especially in the warmer parts of the Indian and Pacific Oceans. They feed upon fishes, and are mostly of moderate size, but some species become eight or ten feet long and four inches broad. [1913 Webster]