Etymology
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radicand (n.)

in mathematics, the number under a radical sign, by 1843, from German, from Modern Latin radicandus, gerundive of radicare "to take root," from radix "root" (from PIE root *wrād- "branch, root").

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polyvinyl (n.)

"polymeric substance derived from vinyl compounds," 1930, polymer of vinyl chloride. In chemistry, vinyl was used from 1863 as the name of a univalent radical derived from ethylene, from Latin vinum "wine" (see wine (n.)), because ethyl alcohol is the ordinary alcohol present in wine.

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revolutionize (v.)

1797, "to cause (a state, etc.) to undergo a (political) revolution, effect a change in the political constitution of;" see revolution + -ize. Transferred sense of "change a thing completely and fundamentally, effect radical change in" is by 1799. Related: Revolutionized; revolutionizing.

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red (adj.2)

"Bolshevik, ultra-radical, revolutionary," 1917, from red (adj.1), the color they adopted for themselves. The association in Europe of red with revolutionary politics (on notion of blood and violence) is from at least 1297, but got a boost 1793 with adoption of the red Phrygian cap (French bonnet rouge) as symbol of the French Revolution. The first specific political reference in English was in 1848 (adj.), in reports of the Second French Republic (a.k.a. Red Republic).

Red Army is from 1918;  Red China is attested from 1934. Red-baiting is attested by 1929. The noun meaning "a radical, a communist" is from 1851.

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mercuric (adj.)

1828, in chemistry, "relating to or containing mercury," from mercury + -ic. Specifically applied to compounds in which each atom of mercury is regarded as bivalent. Mercurous (1840) is applied to those in which two atoms of mercury are regarded as forming a bivalent radical.

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westernization (n.)

also westernisation, 1873, noun of action from westernize (v.). Earliest reference is to Japan.

[The mikado's] late rapid and radical progress in westernization (to evolve a word that the Japanese will need) justifies great expectations of him. [Coates Kinney, "Japanning the English Language," The Galaxy, July-Dec. 1873]
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cyanide (n.)

a salt of hydrocyanic acid, 1826, from cyan-, used in science as a word-forming element for the carbon-nitrogen compound radical, + chemical ending -ide, on analogy of chloride. The best-known is potassium cyanide, bitter-tasting and extremely poisonous but formerly used in photography, electro-metallurgy, etc.

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di- (1)

word-forming element of Greek origin meaning "two, double, twice, twofold," from Greek di-, shortened form of dis "twice," which is related to duo "two" and cognate with bi-, from PIE root *dwo- "two." In chemistry it indicates a compound containing two units of the element or radical to which it is prefixed.

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bromide (n.)

compound of bromine and another metal or radical, 1836, from bromine, the pungent, poisonous element, + -ide. Used medicinally as a sedative; figurative sense of "dull, conventional person or trite saying" popularized by U.S. humorist Frank Gelett Burgess in his book "Are You a Bromide?" (1906). Related: Bromidic.

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loco-foco (n.)
also locofoco, American English, said to date from 1834 in the sense "self-igniting cigar or friction match," of obscure origin. The first element is apparently a misapprehension of the loco- in locomotive ("a word just then becoming familiar" [Century Dictionary]) as "self-, self-moving-." The second element is perhaps a jingling reduplication of this, or somehow from Spanish fuego "fire."

Better remembered, if at all, as a political term: During a heated Democratic party meeting in Tammany Hall c. 1835, the opposition doused the gaslights to break it up, and the radical delegates used loco-foco matches to relight them. When it was publicized, the name loco-foco entered U.S. political jargon (by 1837) and down to the Civil War was applied, usually disparagingly, to a radical faction of the Democratic Party (but by the Whigs to all Democrats).
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