Source : Webster's Revised Unabridged Dictionary (1913)

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; -- called also {ostein}. Chemically
   it is the same as collagen.