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Definition of: pygidium
(pī·jid′ē·əm) noun plural ·gid·i·a (-jid′·ē·ə) Entomol.
The terminal or posterior segment, as of an insect; a caudal shield. [<NL <Gk. pygidion, dim. of pygē rump]
—py·gid′i·al adjective
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