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Entry 1 sense Webster, 1913

Pygidium

· Py·gid·i·um · IPA
01 n. The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.
pl. Pygidia ((#))
  1. 1.
    The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.(Zool.) See: Limulus, Trilobite