[in-ee-uh n]

noun Craniometry.

a point at the external occipital protuberance of the skull.

Origin of inion

1805–15; < New Latin < Greek īníon nape of the neck, equivalent to īn- (stem of ī́s) fiber, sinew + -ion diminutive suffix Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for inion



anatomy the most prominent point at the back of the head, used as a point of measurement in craniometry

Word Origin for inion

C19: from Greek: back of the head
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

inion in Medicine




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.