Pronunciation key

( ek′sos-tōsis )
( ek′so-stōsis )


n. [pl. EXOSTOSES (-sēz) exosto′ses.]

[Mod. L.; Gr. exostōsis < ex- outside + osteon, a bone].

  1. Pathology, Medicine. Abnormal, yet benign tumor or new bony growth on either inner or outer surface of a bone or tooth. Characteristically capped with cartilage.
  2. A morbid formation and protuberance of bone. Morbid bony growth on a bone.
  3. Formation of knots on trees.

Adj. exostot′ic. See Osteochondroma.

exostosis cartilagin′ea, a variety of osteoma consisting of a layer of cartilage developing beneath the periosteum of a bone.

hereditary multiple exostosis, a generally benign, hereditary disorder of enchondral growth of bone, marked by extoses near the extremities of the diaphysis of long bones.


  • The American College Dictionary (Random House) ©1949
  • Webster's New World Dictionary of the American Language (College Edition) ©1955
  • Webster's Improved Dictionary and Everyday Encyclopedia ©1956
  • Funk and Wagnalls Standard Dictionary, Comprehensive International Edition ©1976
  • Encyclopedia and Dictionary of Medicine, Nursing and Allied Health ©1978
  • Encyclopedia Britannica Micropedia ©1984
  • The American Heritage Dictionary, Second College Edition ©1985
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