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The cone shell is one example of a mollusc. Photograph courtesy of the Great Barrier Reef Marine Park Authority.

(genetic biology)

Grammar: noun
plural: molluscs
Definition: an invertebrate animal that typically has a soft unsegmented body covered by a mantle, and may have a protective calcareous shell
Example:
1. Fossils show that most of the modern animal groups, such as annelids, echinoderms, molluscs, arthropods, chordates etc, evolved very rapidly at the end of the Cambrian period about 500 myp.

2. Molluscs include gastropods, bivalves and cephalopods among others.
Related Word: molluscan (adjective)
Alternative Form: mollusk