adjective Also sphe·noi·dal.
  1. being in the shape of a wedge; wedge-shaped.
  2. Anatomy. of or relating to the compound bone of the base of the skull, at the roof of the pharynx.
  1. Anatomy. the sphenoid bone.

Origin of sphenoid

1725–35; < New Latin sphēnoīdēs < Greek sphēnoeidḗs. See sphen-, -oid
Related formspost·sphe·noid, adjectivepre·sphe·noid, adjectivesub·sphe·noid, adjectivesub·sphe·noi·dal, adjectivesu·per·sphe·noid, adjectivesu·per·sphe·noi·dal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for sphenoid

Historical Examples of sphenoid

  • The main body of the sphenoid is at the base of the cranium.

    Pedagogical Anthropology

    Maria Montessori

  • Simple brachycephaly is due to early synostosis of the nasal and sphenoid.


    Eugene S. Talbot

  • The bones that extend backward to the sphenoid are not easily identified.

    Dragons of the Air

    H. G. Seeley

  • Under these conditions we have witnessed fractures of the parietal, of the frontal, and of the sphenoid bones.

    Special Report on Diseases of the Horse

    United States Department of Agriculture

  • The pituitary body itself is lodged in a cavity of the sphenoid bone called the pituitary fossa.

    The Mystery of Space

    Robert T. Browne

British Dictionary definitions for sphenoid


adjective Also: sphenoidal
  1. wedge-shaped
  2. of or relating to the sphenoid bone
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

sphenoid in Medicine


  1. The sphenoid bone.
  1. Of or relating to the sphenoid bone.
  2. Wedge-shaped.
Related formssphe•noidal (-noidl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.