英语词源字典 - 在线词源网站

racemic acid [racemic acid 词源字典]: "A compound (originally obtained from the tartar in grape juice) consisting of equal proportions of the laevo- and dextrorotatory isomers of tartaric acid. Now chiefly historical", Mid 19th cent.; earliest use found in Records of General Science.[racemic acid etymology, racemic acid origin, 英语词源]
reflourish: "To flourish again or further. Chiefly figurative . Now rare", Late Middle English. From re- + flourish, originally after classical Latin reflōrēscere. Compare post-classical Latin reflorere, Middle French reflorir.
racemose: "(Of a flower cluster) taking the form of a raceme", Late 17th century: from Latin racemosus, from racemus (see raceme).
ryokan: "A traditional Japanese inn", Japanese.
redescend: "To go or come down again", Late 16th cent.; earliest use found in Thomas Middleton (d. 1627), playwright. From re- + descend.
radioscope: "An instrument used for radioscopy; specifically = fluoroscope", Late 19th cent.; earliest use found in The Newark Advocate. From radio- + -scope.
Rhizopoda: "A phylum of single-celled animals which includes the amoebas and their relatives, which have extensible pseudopodia", Modern Latin (plural), from rhizo- 'root' + Greek pous, pod- 'foot'.
rutherfordium: "The chemical element of atomic number 104, a very unstable element made by high-energy atomic collisions", 1960s: modern Latin, named after E. Rutherford (see Rutherford, Sir Ernest).
respirate: "Assist (a person or animal) to breathe by means of artificial respiration", Mid 17th century: back-formation from respiration.
ruck (1): "A loose scrum formed around a player with the ball on the ground", Middle English (in the sense 'stack of fuel, heap'): apparently of Scandinavian origin; compare with Norwegian ruke 'heap of hay'.
ruck (2): "Compress or move (cloth or clothing) so that it forms a number of untidy folds or creases", Late 18th century (as a noun): from Old Norse hrukka.
ruck (3): "A quarrel or fight, especially a brawl involving several people", 1950s: perhaps a shortened form of ruction or ruckus.
ram-stam: "Impetuous, precipitate; reckless; headstrong", Late 18th cent.; earliest use found in Robert Burns (1759–1796), poet. Origin uncertain. Perhaps from Scots ram-, intensifying prefix + stam to walk with a quick heavy tread; compare earlier ram-tam. In English regional (south-east midland) use apparently of different origin: perhaps from ram + stam; compare English regional (Cornwall) stam-bang (adverb) headlong (attested from 1846 onwards).
rhyparography: "The painting of distasteful or sordid subjects", Late 17th cent.; earliest use found in Edward Phillips (b. 1630), writer and biographer. From classical Latin rhyparographos painter of low or sordid subjects + -y; compare -graphy.
restain: "To stain again; (now especially) to apply a fresh coat of a penetrative dye to a wooden object", Late 18th cent. From re- + stain.
racemic: "Composed of dextrorotatory and laevorotatory forms of a compound in equal proportion", Early 19th century (in racemic acid): from French racémique 'derived from grape juice' (originally referring to tartaric acid in this) + -ic.
relumine: "= relume", Mid 17th cent.; earliest use found in Shakespeare's Othello. Either from post-classical Latin reluminare to restore sight to (late 2nd cent. in Tertullian) from classical Latin re- + lūmināre, or from re- + either lumine or -lumine, probably originally as an alteration of relume in editions of Othello.
reciprocal hybrid: "A hybrid resulting from a reciprocal cross", Late 19th cent.; earliest use found in Sydney Vines (1849–1934), botanist.
revivify: "Give new life or vigour to", Late 17th century: from French revivifier or late Latin revivificare (see re-, vivify).
renunciate (1): "A person who renunciates or gives up something; especially a religious person who has renounced a secular way of life", Late 19th cent. From renunciate.