WordNet (r) 3.0 (2006):

seasnail
    n 1: small tadpole-shaped cold-water fishes with pelvic fins
         forming a sucker; related to lumpfish [syn: snailfish,
         seasnail, sea snail, Liparis liparis]
    2: any of several creeping marine gastropods with a spirally
       coiled shell: whelks; tritons; moon shells; neritids