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Definition of Pygidium
1. n. The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.
Definition of Pygidium
1. the posterior region of certain invertebrates [n -IA] : PYGIDIAL [adj]
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1. n. The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.
1. the posterior region of certain invertebrates [n -IA] : PYGIDIAL [adj]