A molluscan is one of those soft-bodied animals — a member of the group that includes snails, clams, and octopuses. In that noun use it matches mollusc. Though actually, English uses molluscan far more often as an adjective: of or about that group. Biologists write molluscan shell, molluscan fauna, molluscan family. Everyday talk almost always says mollusc or mollusk for the animal itself; molluscan sounds like a textbook or a museum label. It is formed from the scientific group name Mollusca plus -an, the same kind of ending you hear in American. You will rarely hear it in the street. If a student only needs the creature, mollusc is the word they will actually meet.

軟體動物的；也可指軟體動物