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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Py·gid·i·um n.; pl. Pygidia   Zool. The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.
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From: WordNet (r) 2.0

 pygidia
      See pygidium