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The Collaborative International Dictionary
jawfoot

Maxilliped \Max*il"li*ped\, n. [Maxilla + L. pes, pedis, foot.] (Zo["o]l.) One of the mouth appendages of Crustacea, situated next behind the maxill[ae]. Crabs have three pairs, but many of the lower Crustacea have but one pair of them. Called also jawfoot, and foot jaw.

Wiktionary
jawfoot

n. maxilliped