MOLLUS'CA, noun [from Latin mollis, soft.] In zoology, a division or class of animals whose bodies are soft, without an internal skeleton, or articulated covering. Some of them breathe by lungs, others by gills; some live on land, others in water. Some of them are naked; others testaceous or provided with shells. Many of them are furnished with feelers or tentacula.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.