1) Bone substance 2) Collagen component of bone 3) Organic basis of bone 
the organic basis of bone
• (n.) 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.
(os´e-in) the collagen of bone.
Os'se·in noun [ Latin 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 ...
Type: Term Pronunciation: os′ē-in Synonyms: collagen
Ossein is one of the albuminoids. It is the chief organic constituent of bone. Chemically it is similar to collagen.
the collagen of bone, remaining after the mineral matter has been removed by treatment with dilute acid.