Definition of "crustacea" [crus•ta•ce•a]

• Plural form of crustacean. (noun)

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• "Closely allied to the crustacea is the sub-family of the _mollusca_, which includes the oyster, clams, and similar creatures; also the snails, cuttle-fish, slugs, nautilus, sea-squirts, etc., etc."
• "This leads to harmful effects for marine life that rely on calcification, such as crustacea and molluscs."
• "{256} Dr. Reeves supposes these to have been "crustacea:" but their stinging and clinging prove them surely to have been jelly-fish -- medusae."