Bible Dictionaries
Pygidium

Webster's Dictionary

(n.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite.

Bibliography Information
Webster, Noah. Entry for 'Pygidium'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/pygidium.html. 1828.