1. (n.) Any marine snake. See Sea snake.

2. (n.) A large marine animal of unknown nature, often reported to have been seen at sea, but never yet captured.

Loch Ness monster alevin benthon benthos cetacean dolphin fingerling fish fry game fish grilse kipper man-eater man-eating shark marine animal minnow minny nekton panfish plankton porpoise salmon sea monster sea pig sea snake shark smolt sponge tropical fish whale