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ossein

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WordReference Random House Unabridged Dictionary of American English © 2025

os•se•in n. [Biochem.]

Biochemistrythe collagen of bone, remaining after the mineral matter has been removed by treatment with dilute acid.

Latin osse(us) osseous + -in²
1855–60

Collins Concise English Dictionary © HarperCollins Publishers::

ossein / ˈɒsɪɪn/

a protein that forms the organic matrix of bone, constituting about 40 per cent of its matter

Etymology: 19th Century: from Latin osseus bony, from os bone

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