nm. mollusk, (also mollusc) invertebrate animal with a soft body and a hard shell (i.e. oysters, mussels, snails, cuttlefish, etc.)

n. mollusk; borer; clam, cockle

(n.) = mollusc [mollusk].
Ex: The results suggest that in general iodine turnover in periwinkles is slower than observed for other molluscs.