‖Py‐gid″i‐um (?), n.; pl.Pygidia (#). (Zoöl.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.