[ 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

Other words from exostosis

  • ex·os·tosed, adjective
  • ex·os·tot·ic [ek-so-stot-ik, -suh-], /ˌɛk sɒˈstɒt ɪk, -sə-/, adjective

Words Nearby exostosis

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use exostosis in a sentence

  • But why then can we not thus remove a fatty tumour, a true exostosis, or a malignant growth?

    The Action of Medicines in the System | Frederick William Headland
  • As a result there is a marked depression at the coronet, the depression being heightened in effect by the exostosis in front.

    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
  • The nearness of the exostosis to the tibiotarsal articulation can be definitely determined by palpation.

    Lameness of the Horse | John Victor Lacroix
  • In making examinations one must not be deceived by the inconspicuous and seemingly insignificant exostosis which has a broad base.

    Lameness of the Horse | John Victor Lacroix

British Dictionary definitions for exostosis


/ (ˌɛksɒˈstəʊsɪs) /

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

Origin of 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