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-in

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-in

A suffix widely used to form names of biochemical substances, including proteins (e.g., globulin), lipids (lecithin), hormones (insulin), botanical principles (digoxin), antibiotics (streptomycin), synthetic drugs (aspirin), dyes (eosin), and others; initially a variant of -ine; in a few terms (e.g., dentin, thyroxin, spellings with and without final e are both found.
[G. -inos,, L. -inus, adj. suffixes]
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