sea snake

noun
any of several venomous marine snakes of the family Hydrophidae, having a finlike tail.

Origin:
1745–55

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World English Dictionary
sea snake
 
n
any venomous snake of the family Hydrophiidae, of tropical seas, that swims by means of a laterally compressed oarlike tail

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Scientists find that some types of sea snake possess homing behavior that may scupper conservation efforts.
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