noun Craniometry.
a point at the external occipital protuberance of the skull.

1805–15; < Neo-Latin < Greek īníon nape of the neck, equivalent to īn- (stem of ī́s) fiber, sinew + -ion diminutive suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inion (ˈɪnɪən)
anatomy the most prominent point at the back of the head, used as a point of measurement in craniometry
[C19: from Greek: back of the head]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

inion in·i·on (ĭn'ē-ən)
The most prominent projecting point of the occipital bone at the base of the skull.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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