Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A bony growth on the surface of a bone or tooth.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A benign bony growth, often covered with cartilage, on the surface of a bone or tooth.

from the GNU version of the Collaborative International Dictionary of English

  • n. Any protuberance of a bone which is not natural; an excrescence or morbid enlargement of a bone.
  • n. A knot formed upon or in the wood of trees by disease.

from The Century Dictionary and Cyclopedia

  • n. In pathology, a morbid bony growth on the surface of a bone, arising from bone, periosteum, or articular or epiphyseal cartilage.
  • n. In botany, the formation of woody, wart-like excrescences upon the stems or roots of plants.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a benign outgrowth from a bone (usually covered with cartilage)

Etymologies

Greek exostōsis : ex-, out of; see exo- + osteon, bone; see ost- in Indo-European roots + -ōsis, -osis.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From ex- + Ancient Greek ὀστέον (osteon, "bone"). (Wiktionary)

Examples

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