py·​gid·​i·​um | \ pī-ˈji-dē-əm How to pronounce pygidium (audio) \
plural pygidia\ pī-​ˈji-​dē-​ə How to pronounce pygidia (audio) \

Definition of pygidium

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

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Other Words from pygidium

pygidial \ pī-​ˈji-​dē-​əl How to pronounce pygidial (audio) \ adjective

Examples of pygidium in a Sentence

Recent Examples on the Web 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.

First Known Use of pygidium

1848, in the meaning defined above

History and Etymology for pygidium

New Latin, from Greek pygidion, diminutive of pygē rump

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Time Traveler for pygidium

Time Traveler

The first known use of pygidium was in 1848

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Cite this Entry

“Pygidium.” Dictionary, Merriam-Webster, Accessed 30 Sep. 2020.

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