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[ek-so-stoh-sis, -suh-] /ˌɛk sɒˈstoʊ sɪs, -sə-/
noun, plural exostoses
[ek-so-stoh-seez, -suh-] /ˌɛk sɒˈstoʊ siz, -sə-/ (Show IPA).
the abnormal formation of a bony growth on a bone or tooth.
Origin of exostosis
1730-40; < New Latin < Greek exóstōsis an outgrowth. See ex-3, ostosis
Related forms
exostosed, adjective
[ek-so-stot-ik, -suh-] /ˌɛk sɒˈstɒt ɪk, -sə-/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for exostosis
Historical Examples
  • And finally, a very important feature to be noted, is the location of the exostosis.

    Lameness of the Horse John Victor Lacroix
  • This change may consist of induration, exostosis, or even anchylosis.

    Special Report on Diseases of Cattle U.S. Department of Agriculture
  • From the fact that it projects from the surface of the bone it is often spoken of as an exostosis.

    Manual of Surgery Alexis Thomson and Alexander Miles
  • It may be of the natural form and size, but the passage through it more or less obstructed by exostosis.

    A System of Midwifery Edward Rigby
  • This method is only indicated if the exostosis is situated at the entrance of the meatus and is pedunculated.

  • Ringbone is the designation of the exostosis which is found on the coronet and in the digital and phalangeal regions.

    Special Report on Diseases of the Horse United States Department of Agriculture
  • The nearness of the exostosis to the tibiotarsal articulation can be definitely determined by palpation.

    Lameness of the Horse John Victor Lacroix
  • This affection, popularly termed bone spavin, is an exostosis of the hock joint.

    Special Report on Diseases of the Horse United States Department of Agriculture
  • When it does, the exostosis is larger, and the general deformity of the hoof greater.

    Diseases of the Horse's Foot Harry Caulton Reeks
  • When an exostosis has developed puncture firing is the remedy par excellence.

    Lameness of the Horse John Victor Lacroix
British Dictionary definitions for exostosis


noun (pl) -ses (-siːz)
an abnormal bony outgrowth from the surface of a bone
Word Origin
C18: via New Latin from Greek, from ex-1 + osteon 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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exostosis in Medicine

exostosis ex·os·to·sis (ěk'sŏ-stō'sĭs)
n. pl. -ses (-sēz)
A projection that is capped by cartilage and arises from a bone that develops from cartilage. Also called hyperostosis, poroma.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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