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fretwork (n.)[fretwork 词源字典]: also fret-work, "ornamental work consisting of frets," c. 1600, from fret (n.1) + work (n.).[fretwork etymology, fretwork origin, 英语词源]
Freudian (adj.): 1910, of or pertaining to the work or theories of Sigmund Freud (1856-1939), Austrian psychiatrist. Freudian slip first attested 1959.
Frey: god of the earth's fruitfulness in Norse mythology, from Old Norse frey "lord," from Proto-Germanic *frawan "lord," from suffixed form of PIE *pro- (see pro-).
Freya: goddess of sexual love and beauty in Norse mythology, from Old Norse Freyja, which is related to Old English frea "lord;" Old Saxon frua, Middle Dutch vrouwe "woman, wife," German Frau; see frau).
Frigga is usually considered the goddess of married love; Freya, the goddess of love, the northern Venus. Actually, Frigga is of the Aesir family of Scandinavian myth; Freya, of the Vanir family; the two lines of belief merged, and the two goddesses are sometimes fused, and sometimes confused. [Joseph T. Shipley, "The Origins of English Words," 1984]
friable (adj.): 1560s, from Middle French friable (16c.) and directly from Latin friabilis "easily crumbled or broken," from friare "rub away, crumble into small pieces," related to fricare "to rub" (see friction). Related: Friability.
friar (n.): late 13c., from Old French frere "brother, friar" (9c., Modern French frère), originally referring to the mendicant orders (Franciscans, Augustines, Dominicans, Carmelites), who reached England early 13c., from Latin frater "brother" (see brother).
friary (n.): 1530s, from Middle French, from Old French frarie, from Medieval Latin fratria "a fraternity," from frater (see brother).
fricassee (n.): 1560s, from Middle French fricassée, noun use of fem. past participle of fricasser "mince and cook in sauce" (15c.), which is of uncertain origin. Perhaps a compound from elements related to or altered by Middle French frire "to fry" (see fry (v.)) and casser, quasser "to break, cut up" (see quash (v.)). As a verb, from 1650s.
fricative (adj.): 1854, literally "characterized by friction," from Modern Latin fricativus, from Latin fricat-, past participle stem of fricare "to rub" (see friction). As a noun, "a fricative consonant," from 1863.
fricking (adj.): euphemism for fucking, by 1913. Related: Frick (v.).
friction (n.): 1560s, "a chafing, rubbing," from Middle French friction (16c.) and directly from Latin frictionem (nominative frictio) "a rubbing, rubbing down," noun of action from past participle stem of fricare "to rub, rub down," which is of uncertain origin. Watkins suggests possibly from PIE root *bhreie- "to rub, break." Sense of "resistance to motion" is from 1722; figurative sense of "disagreement, clash, lack of harmony, mutual irritation" first recorded 1761. Related: Frictional.
Friday (n.): sixth day of the week, Old English frigedæg "Friday, Frigga's day," from Frige, genitive of *Frigu (see Frigg), Germanic goddess of married love. The day name is a West Germanic translation of Latin dies Veneris "day of (the planet) Venus," which itself translated Greek Aphrodites hemera.

Compare Old Norse frijadagr, Old Frisian frigendei, Middle Dutch vridach, Dutch vrijdag, German Freitag "Friday," and the Latin-derived cognates Old French vendresdi, French vendredi, Spanish viernes. In Germanic religion, Freya (q.v.) corresponds more closely in character to Venus than Frigg does, and some early Icelandic writers used Freyjudagr for "Friday."

A fast-day in the Church, hence Friday face (17c.) for a gloomy countenance. Black Friday as the name for the busy shopping day after U.S. Thanksgiving holiday is said to date from 1960s and perhaps was coined by those who had the job of controlling the crowds, not by the merchants; earlier it was used principally of Fridays when financial markets crashed (1866, 1869, 1873).
fridge (n.): shortened and altered form of refrigerator, 1926, an unusual way of word-formation in English; perhaps influenced by Frigidaire (1919), name of a popular early brand of self-contained automatically operated iceless refrigerator (Frigidaire Corporation, Detroit, Michigan, U.S.), a name suggesting Latin frigidarium "a cooling room in a bath." Frigerator as a colloquial shortening is attested by 1886.
fried (adj.): mid-14c., past participle adjective from fry (v.). Friend chicken attested by 1832.
Friedrich: see Frederick.
friend (n.): Old English freond "one attached to another by feelings of personal regard and preference," from Proto-Germanic *frijand- "lover, friend" (cognates: Old Norse frændi, Old Danish frynt, Old Frisian friund, Dutch vriend, Middle High German friunt, German Freund, Gothic frijonds "friend"), from PIE *priy-ont-, "loving," present participle form of root *pri- "to love" (see free (adj.)).

Meaning "a Quaker" (a member of the Society of Friends) is from 1670s. Feond ("fiend," originally "enemy") and freond often were paired alliteratively in Old English; both are masculine agent nouns derived from present participle of verbs, but they are not directly related to one another (see fiend). Related: Friends.
friend (v.): in the Facebook sense, attested from 2005, from the noun. Friend occasionally has been used as a verb in English since c. 1200 ("to be friends"), though the more usual verb for "join in friendship, act as a friend" is befriend. Related: Friended; friending. Old English had freonsped "an abundance of friends" (see speed (n.)); freondleast "want of friends;" freondspedig "rich in friends."
friendless (adj.): Old English freondleas "friendless," also "orphan," and, as a noun, "an outlaw;" see friend (n.) + -less. Related: Friendlessly; friendlessness.
friendly (adj.): Old English freondlic "well-disposed, kindly;" see friend (n.) + -ly (1). Related: Friendlily; friendliness. As an adverb Old English had freondliche, but by 14c. as the inflections wore off in English it had become indistinguishable from the adjective. Probably owing to that it is rare in modern use; friendfully (mid-15c.) and the correct but ungainly friendlily (1670s) never caught on.
friendship (n.): Old English freondscipe "friendship, mutual liking and regard," also "conjugal love;" see friend (n.) + -ship. Similar formation in Dutch vriendschap, German Freundschaft, Swedish frändskap.