Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
the midpoint of the front border of the foramen magnum
Origin: ModL < Gr basis: see basis
Used by arrangement with John Wiley & Sons, Inc.
basion - Medical Definition
The American Heritage® Medical Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The middle point on the anterior margin of the great foramen opposite the opisthion.