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Freon (n.)[Freon 词源字典]: 1932, proprietary name in U.S. for fluorocarbons used in refrigeration technology. "The name was apparently constructed from fre(eze) + -on used as an arbitrary suffix" [Flood].[Freon etymology, Freon origin, 英语词源]
frequence (n.): 1530s, "an assembling in large numbers," from French fréquence, from Latin frequentia "an assembling in great numbers" (see frequent). From c. 1600 as "frequent occurrence."
frequency (n.): 1550s, "state of being crowded" (now obsolete); 1640s, "fact of occurring often;" from Latin frequentia "an assembling in great numbers, a crowding; crowd, multitude, throng," from frequentem (see frequent). Sense in physics, "rate of recurrence," especially of a vibration, is from 1831. In radio electronics, frequency modulation (1922, abbreviated F.M.) as a system of broadcasting is distinguished from amplitude modulation (or A.M.).
frequent (adj.): mid-15c., "ample, profuse," from Old French frequent, or directly from Latin frequentem (nominative frequens) "often, regular, repeated; in great numbers, crowded, numerous, filled, full, populous," which is of uncertain origin. Watkins says probably from PIE *bhrekw- "to cram together," and compares Greek phrassein "to fence in," Latin farcire "to cram." Meaning "common, usual" is from 1530s; that of "happening at short intervals, often recurring" is from c. 1600.
frequent (v.): late 15c., "visit or associate with," from Old French frequenter "attend frequently; assemble, gather together," from Latin frequentare "visit regularly; do frequently, repeat; assemble in throngs," from frequentem (see frequent (adj.)). Meaning "visit often" is from 1550s. Related: Frequented; frequenter; frequenting.
frequentative (n.): "verb which expresses repetition of action," 1520s, from French fréquentatif, from Late Latin frequentativus "serving to denote the repetition of an act," from Latin frequentat-, past participle stem of frequentare "visit regularly; do frequently, repeat," from frequentem (see frequent (adj.)).
frequently (adv.): "often and at short intervals," 1530s, from frequent (adj.) + -ly (2).
fresco (n.): 1590s, in fresco, literally "in fresh," with a sense of "painted on fresh mortar or plaster," from Italian fresco "cool, fresh," as a noun "coolness, fresh air," from Old High German frisc, from Proto-Germanic *friskaz (see fresh (adj.1)). As a verb from 1849. Related: Frescoed. In 17c.-18c. it also could mean "coolness, shade."
fresh (adj.1): c. 1200, fresh, also fersh, "unsalted; pure; sweet; eager;" the modern form is a metathesis of Old English fersc, of water, "not salt, unsalted," itself transposed from Proto-Germanic *friskaz (cognates: Old Frisian fersk, Middle Dutch versch, Dutch vers, Old High German frisc, German frisch "fresh"). Probably cognate with Old Church Slavonic presinu "fresh," Lithuanian preskas "sweet."

Sense of "new, recent" is from c. 1300; that of "not stale or worn" is from early 14c.; of memories from mid-14c. The metathesis, and the expanded Middle English senses of "new," "pure," "eager" probably are by influence of (or from) Old French fres (fem. fresche; Modern French frais "fresh, cool"), which is from Proto-Germanic *frisko-, and thus related to the English word. The Germanic root also is the source of Italian and Spanish fresco. Related: Freshly. Fresh pursuit in law is pursuit of the wrong-doer while the crime is fresh.
fresh (adj.2): "impudent, presumptuous," or as Century Dictionary puts it, "verdant and conceited," 1848, U.S. slang, probably from German frech "insolent, cheeky," from Old High German freh "covetous," related to Old English frec "greedy, bold" (see freak (n.2)).
fresh-water (adj.): also freshwater, 1520s, from fresh (adj.1) + water (n.1).
freshen (v.): 1690s, "grow brisk, grow stronger" (intransitive), from fresh (adj.1) + -en (1). The earlier verb was simply fresh (mid-14c.). Transitive sense "refresh, revive, renew" is from 1749. Of a drink, "to top off," from 1961. Related: Freshened; freshening.
freshet (n.): 1590s, "stream of fresh water; stream flowing into the sea," from obsolete fresh (n.) "a stream in flood" (1530s), also "mingling of fresh and salt water," from fresh (adj.1). Old English had fersceta in the same sense. Meaning "small flood or increased flow of an ebb tide caused by rain or melting snow" is from 1650s.
freshman (n.): 1550s, "newcomer, novice," from fresh (adj.1) in the sense "making one's first acquaintance, inexperienced" + man (n.). Sense of "university student in first year" is attested from 1590s. As an adjective by 1805. Freshwoman is from 1620s. Related: Freshmen; freshmanic, freshmanship, freshmanhood.
freshness (n.): late 14c., from fresh (adj.1) + -ness.
fret (v.): Old English fretan "devour, feed upon, consume," from Proto-Germanic compound *fra-etan "to eat up," from *fra- "completely" (see *per- (1)) + *etan "to eat" (see eat). Cognates include Dutch vreton, Old High German freggan, German fressen, Gothic fraitan.

Used of monsters and Vikings; in Middle English used of animals' eating. Notion of "wear away by rubbing or scraping" (c. 1200) might have come to this word by sound-association with Anglo-French forms of Old French froter "to rub, wipe; beat, thrash," which is from Latin fricare "to rub" (see friction). Figurative use is from c. 1200, of emotions, sins, vices, etc., "to worry, consume, vex" someone or someone's heart or mind, from either the "eating" or the "rubbing" sense. Intransitive sense "be worried, vex oneself" is by 1550s. Modern German still distinguishes essen for humans and fressen for animals. Related: Fretted; fretting. As a noun, early 15c., "a gnawing," also "the wearing effect" of awareness of wrongdoing, fear, etc.
fret (n.1): "ornamental interlaced pattern," late 14c., from Old French frete "interlaced work, trellis work," probably from Frankish *fetur or another Germanic source (cognates: Old English fetor, Old High German feggara "a fetter, shackle") perhaps from the notion of "decorative anklet," or of materials "bound" together.
fret (n.2): "ridge on the fingerboard of a guitar," c. 1500, of unknown origin, possibly from another sense of Old French frete "ring, ferule." Compare Middle English fret "a tie or lace" (early 14c.), freten (v.) "to bind, fasten" (mid-14c.).
fretful (adj.): 1590s, "gnawing; disposed to fret," from fret (n.) (see fret (v.)) + -ful. Related: Fretfully; fretfulness.
fretless (adj.): 1878, "without annoyance," from fret (n.) (see fret (v.)) + -less. By 1962 as "without frets" (of a banjo, guitar, etc.), from fret (n.2).