sea snail

from The Century Dictionary.

• noun In ichthyology, any fish of the family Liparididæ, and especially a member of the genus Liparis, of which there are several species, found in both British and American waters.
• noun In conchology, a marine gastropod whose shell resembles a helix, as those of the family Littorinidæ, of which the periwinkle, Littorina littorea, is a familiar form, and those of the family Naticidæ, of which Lunatia heros and related species are good examples. See also cuts under Natica, Littorinidæ, Nerita, and Neritidæ.

from the GNU version of the Collaborative International Dictionary of English.

• A small fish of the genus Liparis, having a ventral sucker. It lives among stones and seaweeds.
• Any small creeping marine gastropod, as the species of Littorina, Natica, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any saltwater snail; a marine gastropod mollusk.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun small tadpole-shaped cold-water fishes with pelvic fins forming a sucker; related to lumpfish
• noun any of several creeping marine gastropods with a spirally coiled shell: whelks; tritons; moon shells; neritids
• noun small tadpole-shaped cold-water fishes with pelvic fins forming a sucker; related to lumpfish