PYGIDIUM

Etymology

Noun

pygidium (plural pygidia or pygidiums)

(zoology) The caudal plate of trilobites, crustacea, and certain insects.

Source: Wiktionary

Py*gid"i*um, n.; pl. Pygidia. Etym: [NL., fr. Gr. (Zoöl.)

Definition: The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.

Source: Webster’s Unabridged Dictionary 1913 Edition

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