[ek-so-stoh-sis, -suh-]

noun, plural ex·os·to·ses [ek-so-stoh-seez, -suh-] /ˌɛk sɒˈstoʊ siz, -sə-/. Pathology.

the abnormal formation of a bony growth on a bone or tooth.

Nearby words

  1. exoskeleton,
  2. exosmosis,
  3. exosphere,
  4. exospore,
  5. exosporium,
  6. exostosis cartilaginea,
  7. exoteric,
  8. exoterica,
  9. exothermic,
  10. exotic

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. 2019

Examples from the Web for exostosis

British Dictionary definitions for exostosis


noun plural -ses (-siːz)

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

Medicine definitions for exostosis



n. pl. -ses (-sēz)

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.