1) One that actively contributes to the production of a result.
M.Fr. facteur "agent, representative," from L. factor "doer or maker," from facere "to do" (cf. Fr. faire, Sp. hacer); from PIE base *dhe- "to put, to do;" cf. Skt. dadhati "puts, places;" Av. dadaiti "he puts;" Hitt. dai- "to place;" Gk. tithenai "to put, set, place;" Lith. deti "to put;" Rus. det' "to hide," delat' "to do;" O.H.G. tuon; Ger. tun; O.S., O.E. don "to do."
Karvand, from kar- root of Mod.Pers. verb kardan "to do, to make" (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "he makes;" cf. Skt. kr- "to do, to make," krnoti "he makes, he does," karoti "he makes, he does," karma "act, deed;" PIE base kwer- "to do, to make") + -vand a suffix forming adjectives and agent nouns.
Fr.: arbre des facteurs
A diagram representing a systematic way of determining all the prime factors of a number.
1) karvandeh; 2) karvandi
1) (n.) The product of all the positive integers from 1 to n, denoted by
karvandidan, karvand gereftan
The operation of resolving a quantity into factors.
A bright area of the → photosphere of the Sun visible in white light and best seen near the solar limb, although they occur all across the Sun. Faculae raise several hundred kilometers above the photosphere and are associated with → sunspots. They often appear immediately before the formation of a sunspot group and remain visible for several days or weeks after the disappearance of the spots. Faculae are formed when a strong magnetic field heats a region of the photosphere to higher temperatures than the surrounding area.
Facula, from L. fac-, fax "torch" + -ula, → -ule.
Perisk, periska, biriske in Lori, Laki, and Kurd. dialects "spark" (Lârestâni pelita), probably related to Lori porpor "blazing charcoal," Gilaki bur, biur "smokeless red fire;" cf. Tokharian por, puwar "fire;" Gk. pyr "fire;" Hitt. pahhur "fire;" Skt. pū- "to cleanse;" E. fire; O..E. fyr, from P.Gmc. *fuir (cf. O.N. fürr, M.Du. vuur, Ger. Feuer); PIE base *paewr- "fire."
Fr.: échelle de Fahrenheit
A temperature scale (°F) in which the → freezing point of → water is 32 degrees and the → boiling point is 212 degrees; the points are placed 180 degrees apart. It converts to the → Celsius scale by the formula: C = (5/9)(F - 32). See also → Kelvin scale, → Rankine scale, → Reaumur scale.
Developed by the German physicist Gabriel Fahrenheit (1686-1736); → scale.
Fr.: échouer, faillir
1) To be unsuccessful in achieving something expected, attempted,
M.E. failen, from O.Fr. falir "be lacking, miss, not succeed; come to an end; make a mistake; be dying," from Vulgar L. *fallire, from L. fallere "to trip, cause to fall;" figuratively "to deceive, trick, dupe, cheat; fail, be lacking or defective."
Qâvidan, from Choresmian γaw "to fail, to commit
a fault;" cf. Av. gau- "to commit a sin;" Parthian
(+*fra-) pargaw- "to owe, to lack;"
Ossetian qaewyn/qyd "to be in need of something, to lack;"
Proto-Ir. *gaHu- "to be faulty, wanting; to need;"
Fr.: échec, défaillance
1) An act or instance of failing; lack of success.
Verbal noun from → fail.
nazâr, kamtâb (#), kamnur (#)
Lacking brightness, clearness, loudness, strength, etc.
From O.Fr. faint "soft, weak, sluggish," p.p. of feindre "to avoid one's duty by pretending, pretend," from L. fingere "to devise, fabricate," originally "to shape, invent, to form," from PIE base *dheigh- "to form, shape."
Nazâr, from Mid.Pers. nizâr "weak, feeble"
(variant zâr), zarmân "old man, deterioration;"
Av. zairina- "exhausting, slackening," zaurura- "weak through old age,
decrepit;" cf. Skt. jára- "wearing out, exhaustion," jaranā-
"old, decayed," jarimán- "weakness through old age," Gk. geron
"old man," L. granum "grain;" PIE base *ger- "wear away."
faint early Sun paradox
pârâdaxš-e xoršid-e kamtâb-e âqâzin
Fr.: paradoxe du Soleil jeune faible
The contradiction between a colder Sun (about 30% less luminous) some 4 billion years ago, as predicted by models, and the warm ancient Terrestrial and Martian climates derived from geological evidence.
setâre-ye kamnur (#), ~ nazâr
Fr.: étoile faible
For unaided eye, a star of visual magnitude around 5-6. Otherwise, on an image, a star that has a lesser brightness compared to others of the same field.
1) Confidence or trust in a person or thing.
M.E. feith fei, fai "faithfulness to a trust or promise; loyalty to a person; honesty, truthfulness," from Anglo-Fr. and O.Fr. feid, foi "faith, belief, trust, confidence; pledge," from L. fides "trust, faith, confidence, reliance, credence, belief," from root of fidere "to trust,"from PIE root *bheidh- "to trust, confide, persuade."
Imân, loan from Ar. al-imân "faith, belief, trust."
A collected meteorite whose arrival on Earth is witnessed, as opposed to a → find.
M.E. fallen, from O.E. feallan, from P.Gmc. *fallanan (cf. O.N. falla, O.H.G. fallan), from PIE base *phol- "to fall" (cf. Arm. p'ul "downfall;" Lith. puola "to fall").
Oft, stem of oftâdan "to fall;" Mid.Pers. opastan "to fall," patet "falls;" Av. pat- " to fly, fall, rush," patarəta- "winged;" cf. Skt. patati "he flies, falls," pátra- "wing, feather, leaf;" Gk. piptein "to fall," pterux "wing;" L. penna "feather, wing;" O.E. feðer "feather;" PIE base *pet- "to fly, rush."
Fr.: erreur, illusion, faux raisonnement
From L. fallacia "deception," from fallere "to deceive, trick, cheat; fail, be defective."
Titâl (Dehxodâ) "deceit; deceiving speech, fallacious words;" cf. Tabari titâl hâ kərdan "to deceive (somebody) wheedlingly," Pashtu titâl "duplicity, guile, deceit, fraud."
From O.Fr. fals, faus, from L. falsus "deceived, erroneous, mistaken," p.p. of fallere "to deceive, disappoint."
Zif, from Tâleši saf "wrong," from Mid.Pers. zêfân, zaspân "wrong, vile;" in classical Pers. dictionaries zif "churlishness; sin."
Fr.: fausse couleur
In imaging technique, assigning color to black and white images to differentiate features or convey information. → true color.
bâmdâd-e zif, ~ doruqin
Fr.: aube trompeuse
An unusually early glow of the horizon near the rising sun during certain times of the year. This early glow does not originate directly from the Sun, but is rather caused by → zodiacal light. It may be mistaken for a sunrise.
Fr.: faux noyau
An especially concentrated region in the → coma of some → comets, representing the dense cloud of inner coma rather than the much smaller true nucleus. Also called apparent nucleus and → pseudo-nucleus.
Fr.: faux vide
A peculiar, hypothetical state of matter which is predicted to exist by current theories of → elementary particles, including the → grand unified theories. Unlike the ordinary vacuum, a false vacuum has a large → energy density and a large → negative pressure. A false vacuum is the driving force behind the rapid expansion in the → inflationary model of the → Universe.
Philosophy of science: The concept according to which a proposition or theory cannot be scientific if it does not admit consideration of the possibility of its being false. According to Karl Popper (1902-1994), falsifiability is the crucial feature of scientific hypotheses. Any theory not falsifiable is said to be unscientific.