reform (v.)youdaoicibaDictYouDict[reform 词源字典]
c. 1300, "to convert into another and better form," from Old French reformer "rebuild, reconstruct, recreate" (12c.), from Latin reformare "to form again, change, transform, alter," from re- "again" (see re-) + formare "to form" (see form (n.)). Intransitive sense from 1580s.

Meaning "to bring (a person) away from an evil course of life" is recorded from early 15c.; of governments, institutions, etc., from early 15c. Related: Reformed; reforming. Reformed churches (1580s) usually are Calvinist as opposed to Lutheran. Reformed Judaism (1843) is a movement initiated in Germany by Moses Mendelssohn (1729-1786). Reform school is attested from 1859.[reform etymology, reform origin, 英语词源]
reform (n.)youdaoicibaDictYouDict
"any proceeding which brings back a better order of things," 1660s, from reform (v.) and in some uses from French réforme. As a branch of Judaism from 1843.
reformable (adj.)youdaoicibaDictYouDict
late 15c., from reform (v.) + -able.
reformation (n.)youdaoicibaDictYouDict
"improvement, alteration for the better," late 14c., "restoration;" mid-15c., "improvement," from Old French reformacion and directly from Latin reformationem (nominative reformatio), noun of action from past participle stem of reformare (see reform (v.)). In reference to the European religious movement, it is attested by 1540s, borrowed from Luther. The movement began as a bid to reform doctrines and practices of the Church of Rome.
reformatory (adj.)youdaoicibaDictYouDict
1704, from past participle stem of Latin reformare "to transform, change" (see reform (v.)). As a noun, "house of correction for juveniles," from 1758.
reformer (n.)youdaoicibaDictYouDict
1540s, agent noun from reform (v.).
reformist (n.)youdaoicibaDictYouDict
1580s, originally religious; from reform + -ist. Political sense is from 1640s. Related: Reformism.
reformulate (v.)youdaoicibaDictYouDict
1882, from re- + formulate. Related: Reformulated; reformulating.
refract (v.)youdaoicibaDictYouDict
"to bend" (light, sound, heat, etc.), 1610s, back-formation from refraction, and in part from Latin refractus, past participle of refringere. Related: Refracted; refracting.
refraction (n.)youdaoicibaDictYouDict
1570s, from Late Latin refractionem (nominative refractio) "a breaking up," noun of action from past participle stem of Latin refringere "to break up," from re- "back" (see re-) + comb. form of frangere "to break" (see fraction).
refractive (adj.)youdaoicibaDictYouDict
1670s, from Late Latin refractivus, or from refract + -ive.
refractor (n.)youdaoicibaDictYouDict
1769, as a type of telescope, agent noun from refract.
refractory (adj.)youdaoicibaDictYouDict
"stubborn, obstinate, perverse," 1610s (earlier refractorious, 1550s, refractary, c. 1600), from Latin refractarius "obstinate, stubborn," from past participle stem of refringere (see refraction). Related: Refractorily; refractoriness.
refrain (v.)youdaoicibaDictYouDict
mid-14c., from Old French refraigner "restrain, repress, keep in check" (12c., Modern French Réfréner), from Latin refrenare "to bridle, hold in with a bit, check, curb, keep down, control," from re- "back" (see re-) + frenare "restrain, furnish with a bridle," from frenum "a bridle." Related: Refrained; refraining.
refrain (n.)youdaoicibaDictYouDict
late 14c., from Old French refrain "chorus" (13c.), alteration of refrait, noun use of past participle of refraindre "repeat," also "break off," from Vulgar Latin *refrangere "break off," alteration of Latin refringere "break up, break open" (see refraction) by influence of frangere "to break." Influenced in French by cognate Provençal refranhar "singing of birds, refrain." The notion is of something that causes a song to "break off" then resume. OED says not common before 19c.
reframe (v.)youdaoicibaDictYouDict
1580s, from re- + frame (v.). Related: Reframed; reframing.
refrangible (adj.)youdaoicibaDictYouDict
1670s, from stem of Vulgar Latin *refrangere, from re- "back" (see re-) + Latin frangere "to break" (see fraction).
refresh (v.)youdaoicibaDictYouDict
late 14c., from Old French refreschier "refresh, renew" (12c.; Modern French rafraîchir), from re- "again" (see re-) + fresche "fresh" (Modern French frais), from a Germanic source (such as Old High German frisc "fresh," see fresh (adj.)). Related: Refreshed; refreshing.
refreshing (adj.)youdaoicibaDictYouDict
1570s, present participle adjective from refresh (v.). Mental or spiritual sense is attested from 1690s. Related: Refreshingly.
refreshment (n.)youdaoicibaDictYouDict
late 14c., "act or fact of refreshing," originally mental and spiritual, from Old French refreschement (Modern French rafraîchissement, from refreschier (see refresh). Refreshments, of food and drink only, from 1660s.