A yellow crystalline compound or flavonoid found in plants; also an old name for certain vitamin-like substances or bioflavonoids.
From Latin citrus plus the suffix -in (denoting a compound or substance). Used historically in biochemistry, though modern nomenclature has largely replaced it with more specific chemical names.
Citrin was one of the mysterious 'vitamins' early researchers discovered before they could fully analyze them—we now know these were flavonoids, plant compounds with antioxidant powers that humans obsessed over before understanding their actual chemistry.
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