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pygidium |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Pygidium \Py*gid"i*um\, n.; 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}.