noun, plural (especially collectively) sea·snail, (especially referring to two or more kinds or species) sea·snails.
  1. any of several snailfishes of the genus Liparis, of the North Atlantic.
  2. any of several marine gastropods having a spirally coiled shell, as a whelk.

Origin of seasnail

before 1000; Middle English seesnail, Old English sǣsnǣgl. See sea, snail Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019