- retardation (n.)
[retardation 词源字典] - early 15c., "fact or action of making slower in movement or time," from Latin retardationem (nominative retardatio) "a delaying," noun of action from past participle stem of retardare "to make slow, delay, keep back, hinder," from re- (see re-), + tardare "to slow," related to tardus "slow, sluggish" (see tardy). Sense of "educational slowness" is from 1907.[retardation etymology, retardation origin, 英语词源]
- retarded (adj.)
- 1810, "delayed," past participle adjective from retard (v.). In childhood development sense, "mentally slow," attested from 1895 (perhaps inspired by Italian tardivi).
- retarder (n.)
- 1640s, agent noun from retard (v.). Of railway braking mechanisms from 1937.
- retch (v.)
- 1540s, originally "to clear the throat, to cough up phlegm," from Old English hræcan "to cough up, spit" (related to hraca "phlegm"), from Proto-Germanic *khrækijan (cognates: Old High German rahhison "to clear one's throat"), of imitative origin (compare Lithuanian kregeti "to grunt"). Meaning "to make efforts to vomit" is from 1850; sense of "to vomit" is first attested 1888. Related: Retched; retching.
- rete (n.)
- late 14c., in anatomy, from Latin rete "net" (see reticulate (adj.)). Plural is retia.
- retell (v.)
- 1590s, from re- "back, again" + tell (v.). Related: Retold; retelling.
- retention (n.)
- late 14c., from Latin retentionem (nominative retentio) "a retaining, a holding back," noun of action from past participle stem of retinere (see retain). Originally medical; mental sense is from late 15c.
- retentive (adj.)
- late 14c., "able to hold or keep" (mental or physical), from Old French retentif, from Medieval Latin retentivus, from past participle stem of Latin retinere (see retain). Related: Retentively; retentiveness.
- rethink (v.)
- 1700, from re- "back, again" + think (v.). Related: Rethinking.
- reticence (n.)
- c. 1600, from Middle French réticence (16c.), from Latin reticentia "silence, a keeping silent," from present participle stem of reticere "keep silent," from re- (see re-), + tacere "be silent" (see tacit). "Not in common use until after 1830" [OED].
- reticent (adj.)
- 1834, from Latin reticentem (nominative reticens), present participle of reticere "be silent" (see reticence).
- reticle (n.)
- 1650s, from Latin reticulum "little net," diminutive of rete "net" (see reticulate (adj.)).
- reticular (adj.)
- 1590s, from Modern Latin reticularis, from Latin reticulum "little net" (see reticulate (adj.)).
- reticulate (adj.)
- 1650s, from Latin reticulatus "having a net-like pattern," from reticulum "little net," diminutive of rete "net," from PIE *ere- (2) "to separate" (see hermit).
- reticulate (v.)
- 1787, back-formation from reticulated (1728), from reticulate (adj.). Related: Reticulating.
- reticulation (n.)
- 1670s, noun of action or state from reticulate (v.).
- reticule (n.)
- "a ladies' small bag," 1801, from French réticule (18c.) "a net for the hair, a reticule," from Latin reticulum "a little net, network bag" (see reticulate (adj.)).
- reticulum (n.)
- 1650s, "second stomach of a ruminant" (so called from the folds of the membrane), from Latin reticulum "a little net" (see reticulate (adj.)). The word was later given various uses in biology, cytology, histology, etc., and made a southern constellation by La Caille (1763).
- retina (n.)
- late 14c., from Medieval Latin retina "the retina," probably from Vulgar Latin (tunica) *retina, literally "net-like tunic," on resemblance to the network of blood vessels at the back of the eye, and ultimately from Latin rete "net" (see reticulate (adj.)). The Vulgar Latin phrase might be Gerard of Cremona's 12c. translation of Arabic (tabaqa) shabakiyyah "netlike (layer)," itself probably a translation of Greek amphiblestroeides (khiton).
- retinal (adj.)
- 1838; see retina + -al (1).
