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From The Collaborative International Dictionary of English v.0.48:
Ossein \Os"se*in\, 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]