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Fibonacci (adj.)[Fibonacci 词源字典]: 1891 in reference to a series of numbers in which each is equal to the sum of the preceding two, from name of Leonardo Fibonacci (fl. c. 1200) Tuscan mathematician.[Fibonacci etymology, Fibonacci origin, 英语词源]
fibre (n.): chiefly British English spelling of fiber (q.v.); for spelling, see -re.
fibril (n.): 1680s, Anglicization of Modern Latin fibrilla "a little fiber, a filament," especially in botany, diminutive of Latin fibra "a fiber, filament" (see fiber). Latin fibra and fibrilla were used in 17c. physiology in English alongside nativized fibre and fibril. From 1931 as "thread-like molecular formation."
fibrillar (adj.): "pertaining to or of the nature of fibrillae," 1847, from fibrilla (see fibril) + -ar.
fibrillate (v.): 1798, "form into fibrils or fibers," from fibrilla (see fibril) + -ate (2). Related: Fibrillated; fibrillating.
fibrillation (n.): 1842, "state of being fibrillar" (that is, "arranged in fibrils"), noun of action from fibrillate (v.). Especially "a quavering in the fibrils of the muscles of the heart" causing irregular beating (1882).
fibrin (n.): blood-clotting substance, 1800, from Latin fibra "a fiber, filament" (see fiber) + chemical suffix -in (2). So called because it is deposited as a network of fibers that cause the blood to clot.
fibro-cartilage (n.): 1818, from comb. form of fiber + cartilage.
fibroid (adj.): 1848, from fiber + -oid.
fibromyalgia (n.): 1981, said to have been coined by U.S. rheumatologist Mohammed Yunus, from Latin fibra "a fiber, filament" (see fiber) + Greek mys (genitive myos) "muscle" (see muscle (n.)) + -algia "pain." The earlier name for the condition was fibrositis.
fibrosis (n.): "fibrous growth or development in an organ," 1871, a Modern Latin hybrid, from Latin fibra "a fiber, filament" (see fiber) + Greek suffix -osis.
fibrous (adj.): "consisting of, or having the characteristics of, fibers," 1620s, from Modern Latin fibrosus, from Latin fibra "a fiber, filament" (see fiber).
fibula (n.): 1670s, "clasp, buckle, brooch," from Latin fibula "clasp, brooch," related to figere "to fasten, fix" (see fix (v.)). In reference to brooches, the modern English word mostly is used in archaeology. As "smaller bone in the lower leg" from 1706, from a Latin loan-translation of Greek perone "small bone in the lower leg," originally "clasp, brooch; anything pointed for piercing or pinning;" the bone was so called because it resembles a clasp such as that found in a modern safety pin. Related: Fibular.
fiche (n.): 1949, "slip of paper, form," especially "the form filled in by foreign guests in French hotels" [OED], from French fiche "card, index card, slip, form" (15c.), verbal noun from Old French fichier "to attach, stick into, pin on" (12c.), from Vulgar Latin *figicare, from Latin figere "to fix, fasten" (see fix (v.)). Sense of "card, strip of film" is a shortening of microfiche (1950).
fichu (n.): "scarf, neckerchief, small, triangular piece forming part of a woman's dress," 1803, from French fichu (18c. in this sense), apparently a noun use of the adjective fichu "carelessly thrown on," from Latin figere "to fasten" (see fix (v.)). "[M]od. substitution for a coarser word" [Weekley].
fickle (adj.): c. 1200, "false, treacherous, deceptive, deceitful, crafty" (obsolete), probably from Old English ficol "deceitful, cunning, tricky," related to befician "deceive," and to facen "deceit, treachery; blemish, fault." Common Germanic (compare Old Saxon fekan "deceit," Old High German feihhan "deceit, fraud, treachery"), from PIE *peig- (2) "evil-minded, treacherous, hostile" (see foe).

Sense of "changeable, inconstant, unstable" is from c. 1300 (especially of Fortune and women). Related: Fickleness. Fickly (c. 1300) is rare or obsolete. Also with a verb form in Middle English, fikelen "to deceive, flatter," later "to puzzle, perplex," which survived long enough in Northern dialects to get into Scott's novels. Fikel-tonge (late 14c.) was an allegorical or character name for "one who speaks falsehoods."
fictile (adj.): 1620s, "molded or formed by art," from Latin fictilis "made of clay, earthen," from fictio "a fashioning" (see fiction). From 1670s as "capable of being molded." From 1854 as "pertaining to pottery." Related: Fictility.
fiction (n.): early 15c., ficcioun, "that which is invented or imagined in the mind," from Old French ficcion "dissimulation, ruse; invention, fabrication" (13c.) and directly from Latin fictionem (nominative fictio) "a fashioning or feigning," noun of action from past participle stem of fingere "to shape, form, devise, feign," originally "to knead, form out of clay," from PIE *dheigh- "to build, form, knead" (source also of Old English dag "dough;" see dough).

Meaning "prose works (not dramatic) of the imagination" is from 1590s, at first often including plays and poems. Narrower sense of "the part of literature comprising novels and short stories based on imagined scenes or characters" is by early 19c. The legal sense (fiction of law) is from 1580s. A writer of fiction could be a fictionist (1827). The related Latin words included the literal notion "worked by hand," as well as the figurative senses of "invented in the mind; artificial, not natural": Latin fictilis "made of clay, earthen;" fictor "molder, sculptor" (also borrowed 17c. in English), but also of Ulysses as "master of deceit;" fictum "a deception, falsehood; fiction."
fictional (adj.): "pertaining to fiction," 1833, from fiction + -al (1). Earlier fictitious also was used in this sense (1773).
fictionalization (n.): 1946, noun of action from fictionalize.