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Definition of: osteoclast
(os′tē·ə·klast′) noun
1. Surg. An instrument for effecting osteoclasis.
2. Anat. A large multinucleate cell found in the marrow of bones and concerned in the absorption of bony tissue during the formation of canals, cavities, etc. [<G osteoklast <Gk. osteon a bone + klastos broken <klaein break]
—os′·te·o·clas′tic adjective
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