[bey-see-on, -zee-]

noun Craniometry.

the midpoint of the anterior margin of the foramen magnum.

Origin of basion

1875–80; < New Latin < Greek bás(is) (see basis) + -ion noun suffix Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for basion



anatomy the midpoint on the forward border of the foramen magnum

Word Origin for basion

C19: from New Latin, from Latin basis base 1
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

basion in Medicine


[bāsē-ŏn′, -zē-]


The middle point on the anterior margin of the great foramen opposite the opisthion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.