GNU Collaborative International Dictionary of English
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Ossein (?), n. [L. os bone.] (Physiol. Chem.) The organic basis of bone tissue; the residue after removal of the mineral matters from bone by dilute acid; in embryonic tissue, the substance in which the mineral salts are deposited to form bone; bone collagen; -- called also ostein. Chemically it is the same as collagen.
[1913 Webster +PJC]