Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The middle of the anterior margin of the foramen magnum of the skull.

from the GNU version of the Collaborative International Dictionary of English

  • n. The middle of the anterior margin of the great foramen of the skull.

from The Century Dictionary and Cyclopedia

  • n. In anatomy, the middle of the anterior margin of the foramen magnum. See cut under craniometry.

Etymologies

From Ancient Greek a base. (Wiktionary)

Examples

Wordnik is becoming a not-for-profit! Read our announcement here.

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.

  • "The point where the anterior margin of the foramen magnum is intersected by the median sagittal plane. The point is located on the inner border of the anterior margin of the foramen magnum directly opposite of opisthion. In rare cases, the determination of the position of basion may be made difficult by a thickening of the anterior margin. In height measurements of the braincase, basion is positioned somewhat farther onto the underside of the margin of the foramen magnum (hypobasion), so that the observer may distinguish between an inferior and a posterior basion for reasons of convenience and technical demands."
    - SNPA

    March 21, 2009