[ek-so-stoh-sis, -suh-]
noun, plural ex·os·to·ses [ek-so-stoh-seez, -suh-] /ˌɛk sɒˈstoʊ siz, -sə-/. Pathology.
  1. 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 formsex·os·tosed, adjectiveex·os·tot·ic [ek-so-stot-ik, -suh-] /ˌɛk sɒˈstɒt ɪk, -sə-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for exostosis


noun plural -ses (-siːz)
  1. an abnormal bony outgrowth from the surface of a bone

Word Origin for exostosis

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

exostosis in Medicine


n. pl. -ses (-sēz)
  1. A projection that is capped by cartilage and arises from a bone that develops from cartilage.hyperostosis poroma
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.