in·​i·​on ˈi-nē-ˌän How to pronounce inion (audio)
: the external occipital protuberance of the skull

Example Sentences

Recent Examples on the Web Strike your tools in a rough horizontal line from the nose and cheekbones to the inion (the projecting bump at the back of the skull). Ed Yong, Discover Magazine, 16 Feb. 2011

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

Word History


New Latin, from Greek, back of the head, diminutive of in-, is sinew, tendon

First Known Use

circa 1811, in the meaning defined above

Time Traveler
The first known use of inion was circa 1811

Dictionary Entries Near inion

Cite this Entry

“Inion.” Dictionary, Merriam-Webster, Accessed 29 Mar. 2023.

Medical Definition

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