pygidium

noun

py·gid·i·um | \ pī-ˈji-dē-əm

\

plural pygidia\pī-ˈji-dē-ə

\

Definition of pygidium

: a caudal structure or the terminal body region of various invertebrates

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The trilobite spans 146 meters from cephalon to pygidium, or head to tail, and is carved into the shape of a spiny Ceraurus trilobite instead of the plainer state fossil, Calymene. — Giorgia Guglielmi, Science | AAAS, "Top stories: Semen-dwelling viruses, password-guessing AI, and a trilobite-shaped corn maze," 22 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'pygidium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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The first known use of pygidium was in 1848

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