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From The Collaborative International Dictionary of English v.0.48:
osteoclast \os"te*o*clast\, n. [Osteo- + Gr. kla^n to break.] 1. (Physiol.) Same as myeloplax, a large multinucleate cell within the bone, which functions in the absroption and removal of bone tissue. [1913 Webster +PJC] Note: The osteoclasts occur usually in pits or cavities which they appear to have excavated, and are supposed to be concerned in the absorption of the bone matrix. [1913 Webster] 2. An instrument for performing osteoclasis. [1913 Webster]