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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Pygidium \Py*gid"i*um\, noun; pl. {Pygidia}. [NL., fr. Gr. ?, dim. of ? the rump.] (Zo["o]l.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of {Limulus} and {Trilobite}.
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