Bible Dictionaries
Pygidium
Webster's Dictionary
(n.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.
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Bibliography Information
Webster, Noah. Entry for 'Pygidium'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/pygidium.html. 1828.