late 14c., also citrine (early 15c.), from Old French citron "citron, lemon" (14c.), possibly from Old Provençal citron, from Latin citrus and influenced by lemon; or else from augmentative of Latin *citrum, related to citrus "citron tree," citreum (malum) "citron" (see citrus). Apparently the only citrus fruit known to the Greeks and Romans.
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