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|Noun||1.||seasnail - small tadpole-shaped cold-water fishes with pelvic fins forming a sucker; related to lumpfish|
|2.||seasnail - any of several creeping marine gastropods with a spirally coiled shell: whelks; tritons; moon shells; neritids|
gastropod, univalve - a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes
whelk - large carnivorous marine gastropods of coastal waters and intertidal regions having a strong snail-like shell
triton - tropical marine gastropods having beautifully colored spiral shells
limpet - any of various usually marine gastropods with low conical shells; found clinging to rocks in littoral areas