Etymology
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Words related to citrus

citric (adj.)

"pertaining to or derived from citrons or lemons," 1800, from Modern Latin citricum (in acidum citricum "citric acid," discovered by German chemist Carl Wilhelm Scheele in 1784); see citrus + -ic. The classical adjective was citreus.

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citrine (adj.)

"lemon-colored, yellow or greenish-yellow," late 14c., from French citrin, from Latin citrus (see citrus). From 1879 as a color name.

citron (n.)

"large, thick-rinded, lemon-like citrus fruit," late 14c., also citrine (early 15c.), from Old French citron "citron, lemon" (14c.), possibly from Old Provençal citron, from Latin citrus "citron-tree," and influenced by lemon; or else from augmentative of Latin citreum (mālum) "citron (apple);" see citrus.

Apparently the citron was the only citrus fruit known to the Greeks and Romans; the word was used in English to also mean "lemon" or "lime" until the sense became restricted 17c.

citronella (n.)

1858 in reference to a type of fragrant grass, and especially to the oil it yields, from French citronelle "lemon liquor," from citron (see citrus). Originally an Asiatic grass used in perfumes and soaps, later applied to a substance found in lemon oil, etc. Related: Citronellic.