mollusc, mollusk, shellfish - invertebrate having a soft unsegmented body usually enclosed in a shell

class Gasteropoda, class Gastropoda, Gasteropoda, Gastropoda - snails and slugs and their relatives

abalone, ear-shell - any of various large edible marine gastropods of the genus Haliotis having an ear-shaped shell with pearly interior

conch - any of various edible tropical marine gastropods of the genus Strombus having a brightly-colored spiral shell with large outer lip

snail - freshwater or marine or terrestrial gastropod mollusk usually having an external enclosing spiral shell

slug - any of various terrestrial gastropods having an elongated slimy body and no external shell

seasnail - any of several creeping marine gastropods with a spirally coiled shell: whelks; tritons; moon shells; neritids

Ancylus fluviatilis, freshwater limpet, river limpet - minute conical gastropod superficially resembling a limpet but living and feeding on freshwater plants

nudibranch, sea slug - any of various marine gastropods of the suborder Nudibranchia having a shell-less and often beautifully colored body

Aplysia punctata, sea hare - naked marine gastropod having a soft body with reduced internal shell and two pairs of ear-like tentacles

bubble shell - marine gastropod mollusk having a very small thin shell

physa - any member of the genus Physa

cowrie, cowry - any of numerous tropical marine gastropods of the genus Cypraea having highly polished usually brightly marked shells

aplacophoran, solenogaster - deep-water wormlike mollusks lacking calcareous plates on the body but having fine slimy spicules on the covering mantle

zoological science, zoology - the branch of biology that studies animals