rapport (n.)youdaoicibaDictYouDict[rapport 词源字典]
1660s, "reference, relation, relationship," from French rapport "bearing, yield, produce; harmony, agreement, intercourse," back-formation from rapporter "bring back; refer to," from re- "again" (see re-) + apporter "to bring," from Latin apportare "to bring," from ad- "to" (see ad-) + portare "to carry" (see port (n.1)).

Psychological meaning "intense harmonious accord," as between therapist and patient, is first attested 1894, though the word had been used in a very similar sense with reference to mesmerism from 1845 (first recorded in Poe). See also report (n.). Johnson frowns on the word and credits its use in English to Sir William Temple, naturalizer of French terms, who did use it but was not the first to do so.[rapport etymology, rapport origin, 英语词源]
rapportage (n.)youdaoicibaDictYouDict
"the describing of events in writing," 1903, from French rapportage, literally "tale-telling," from rapporter (see rapport).
rapporteur (n.)youdaoicibaDictYouDict
c. 1500, from French rapporteur "tell-tale, gossip; reporter," from rapporter (see report (n.)).
rapprochement (n.)youdaoicibaDictYouDict
"establishment of cordial relations," 1809, from French rapprochement "reunion, reconciliation," literally "a bringing near," from rapprocher "bring near," from re- "back, again" (see re-) + aprochier (see approach (v.)).
rapscallion (n.)youdaoicibaDictYouDict
1690s, alteration of rascallion (1640s), a fanciful elaboration of rascal (q.v.). It had a parallel in now-extinct rampallion (1590s), from Middle English ramp (n.2) "ill-behaved woman."
rapt (adj.)youdaoicibaDictYouDict
late 14c., "carried away in an ecstatic trance," from Latin raptus, past participle of rapere "seize, carry off" (see rape (v.)). A figurative sense, the notion is of "carried up into Heaven (bodily or in a dream)," as in a saint's vision. Latin literal sense of "carried away" was in English from 1550s. In 15c.-17c. the word also sometimes could mean "raped." Sense of "engrossed" first recorded c. 1500. As a past participle adjective, in English it spawned the back-formed verb rap "to affect with rapture," which was common c. 1600-1750.
raptor (n.)youdaoicibaDictYouDict
c. 1600, "ravisher, abductor," from Latin raptor "a robber, plunderer, abductor, ravisher," agent noun from past participle stem of rapere "to seize" (see rapid). Ornithological use is from 1873 (1823 in Latin plural Raptores).
raptorial (adj.)youdaoicibaDictYouDict
"predatory," 1825, from raptor + -ial. Alternative raptatorial "predacious" (1840) is from Latin raptatus, past participle of raptare.
rapture (n.)youdaoicibaDictYouDict
c. 1600, "act of carrying off," from Middle French rapture, from Medieval Latin raptura "seizure, rape, kidnapping," from Latin raptus "a carrying off, abduction, snatching away; rape" (see rapt). Earliest attested use in English is of women and in 17c. it sometimes meant rape (v.), which word is a cognate of this. Sense of "spiritual ecstasy, state of mental transport" first recorded c. 1600 (raptures).
rapture (v.)youdaoicibaDictYouDict
1630s, from rapture (n.). Related: Raptured; rapturing.
rapturous (adj.)youdaoicibaDictYouDict
1670s, from rapture + -ous. Related: Rapturously (1660s).
rara avis (n.)youdaoicibaDictYouDict
c. 1600, "peculiar person," from Latin rara avis, literally "strange bird," from rara, fem. of rarus "rare" (see rare (adj.1)) + avis "bird" (see aviary). Latin plural is raræ aves. Horace's peacock (a Roman delicacy), Juvenal's black swan ("Rara avis in terris, nigroque simillima cygno").
rare (adj.1)youdaoicibaDictYouDict
"unusual," late 14c., "thin, airy, porous;" mid-15c., "few in number and widely separated, sparsely distributed, seldom found;" from Old French rere "sparse" (14c.), from Latin rarus "thinly sown, having a loose texture; not thick; having intervals between, full of empty spaces," from PIE *ra-ro-, from root *ere- "to separate; adjoin" (cognates: Sanskrit rte "besides, except," viralah "distant, tight, rare;" Old Church Slavonic rediku "rare," Old Hittite arhaš "border," Lithuanian irti "to be dissolved"). "Few in number," hence, "unusual." Related: Rareness. In chemistry, rare earth is from 1818.
rare (adj.2)youdaoicibaDictYouDict
"undercooked," 1650s, variant of Middle English rere, from Old English hrere "lightly cooked," probably related to hreran "to stir, move, shake, agitate," from Proto-Germanic *hrorjan (cognates: Old Frisian hrera "to stir, move," Old Saxon hrorian, Dutch roeren, German rühren, Old Norse hroera), from PIE base *kere- "to mix, confuse; cook" (cognates: Greek kera- "to mix," krasis "mixture"). Originally of eggs, not recorded in reference to meat until 1784, and according to OED, in this sense "formerly often regarded as an Americanism, although it was current in many English dialects ...."
rare (v.)youdaoicibaDictYouDict
"rise up," 1833, dialectal variant of rear (v.1). Sense of "eager" (in raring to go) first recorded 1909. Related: Rared; raring.
rarebit (n.)youdaoicibaDictYouDict
1785, perversion of (Welsh) rabbit, as if from rare (adj.) + bit (n.). See Welsh.
raree showyoudaoicibaDictYouDict
"peep show contained in a box," 1680s, so called "in imitation of the foreign way of pronouncing rare show" [Johnson]. "Johnson's statement is prob. correct; the early exhibitors of peep-shows appear to have been usually Savoyards, from whom the form was no doubt adopted" [OED]. Early "peep shows" were more innocent than what usually was meant later by that word.
rarefaction (n.)youdaoicibaDictYouDict
c. 1600, from Middle French raréfaction or directly from Medieval Latin rarefactionem (nominative rarefactio), noun of action from past participle stem of Latin rarefacere (see rarefy). Used chiefly in reference to gases.
rarefy (v.)youdaoicibaDictYouDict
late 14c., from Old French rarefier (14c.) and directly from Medieval Latin rarificare, from Latin rarefacere "make rare," from rarus "rare, thin" (see rare (adj.1)) + facere "to make" (see factitious). Related: Rarefied.
rarely (adv.)youdaoicibaDictYouDict
1550s, from rare (adj.1) + -ly (2). "Seldom, not often;" also "finely, excellently."