osteoclast(n = noun.body) - cell that functions in the breakdown and resorption of bone tissue;
is a kind of bone cell

1.  Same as myeloplax, a large multinucleate cell within the bone, which functions in the absroption and removal of bone tissue. [1913 Webster]
" 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]