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[sfee-noid] /ˈsfi nɔɪd/
adjective, Also, sphenoidal
being in the shape of a wedge; wedge-shaped.
Anatomy. of or relating to the compound bone of the base of the skull, at the roof of the pharynx.
Anatomy. the sphenoid bone.
Origin of sphenoid
1725-35; < New Latin sphēnoīdēs < Greek sphēnoeidḗs. See sphen-, -oid
Related forms
postsphenoid, adjective
presphenoid, adjective
subsphenoid, adjective
subsphenoidal, adjective
supersphenoid, adjective
supersphenoidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for sphenoid
Historical Examples
  • 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.

    Degeneracy 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
  • The frontal bone was thrown back, and flattened on the sphenoid in such a manner that the eyes appeared above his head.

    Curiosities of Medical Experience

    J. G. (John Gideon) Millingen
  • They are bounded anteriorly by the frontal bone, posteriorly by the occipital, and laterally by the temporal and sphenoid bones.

    A Practical Physiology Albert F. Blaisdell
  • Tapeisocephaly (low head) is due to synostosis of the great wings of the sphenoid with the frontal.

    Degeneracy Eugene S. Talbot
  • The most regular and beautiful forms, and the ones that are commonest in our racial stocks are the ellipsoid, ovoid and sphenoid.

    Pedagogical Anthropology Maria Montessori
  • These cavities are bounded superiorly by the sphenoid and 390 ethmoid bones; inferiorly, by the hard palate.

British Dictionary definitions for sphenoid


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
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sphenoid in Medicine

sphenoid sphe·noid (sfē'noid')
The sphenoid bone. adj.

  1. Of or relating to the sphenoid bone.

  2. Wedge-shaped.

sphe·noi'dal (-noid'l) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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