Etymology
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sucre (n.)

monetary unit of Ecuador, 1886, named for Antonio José de Sucre (1795-1830), Venezuelan general and liberator of Ecuador.

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luminaire (n.)

electric lighting unit, 1921, a trade term, from French luminaire, from Old French luminarie "lamp, candle; brightness, illumination" (see luminary).

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bar (n.4)

unit of pressure, coined 1903 from Greek baros "weight," which is related to barys "heavy" (from PIE root *gwere- (1) "heavy").

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mark (n.2)

"unit of money or weight," late Old English marc, a unit of weight (chiefly for gold or silver) equal to about eight ounces, probably from Old Norse mörk "unit of weight," cognate with German Mark and probably ultimately a derivative of mark (n.1), perhaps in a sense of "imprinted weight or coin." It was a unit of account in England into 18c., perhaps originally introduced by the Danes, but never the name of a particular coin.

The word is found in all the Germanic and Romanic languages (compare Old Frisian merk, Dutch mark, Medieval Latin marca, French marc (11c.), Spanish and Italian marco); in English it was used from 18c. in reference to various continental coinages, especially the silver money of Germany first issued 1875.

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caddy (n.)

"small box for tea," 1792, from catty (1590s), Anglo-Indian unit of weight, from Malay (Austronesian) kati, a unit of weight. The catty was adopted as a standard mid-18c. by the British in the Orient and fixed in 1770 by the East India Company at a pound and a third. Apparently the word for a measure of tea was transferred to the chest it was carried in.

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gauss 

C.G.S. unit of intensity of a magnetic field, 1882, named for German mathematician Karl Friedrich Gauss (1777-1855). Related: Gaussage; gaussian.

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farad (n.)

unit of electric capacity, suggested 1861, first used 1868, named for English physicist Michael Faraday (1791-1867). Related: Faradic.

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Deutsch 

the German word for "German;" see Dutch. Deutschmark (abbreviation DM), the monetary unit of the old German Federal Republic, was introduced June 1948.

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bel (n.)

unit of power level in measuring sound, 1929, named for Scottish-born telephone pioneer Alexander Graham Bell (1847-1922).

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buck (n.2)

"dollar," 1856, American English, perhaps an abbreviation of buckskin as a unit of trade among Indians and Europeans in frontier days (attested from 1748).

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