An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13176 Search : far
extremophile
  استومدوست   
ostomdust

Fr.: extrêmophile   

A → microorganism with the ability to thrive in extreme environmental conditions that would kill other species. These conditions include high temperatures, very low temperatures, high pressures, high levels of radiation, and high concentrations of salt in water.

extreme; → -phile.

extremum
  استومه   
ostomé

Fr.: extrémum   

A maximum or minimum value of a function in a specified interval.

From L. extremus, → extreme.

Ostomé, from ostom, → extreme + noun suffix , from Mid.Pers. -ag.

extrinsic
  برونگین   
borungin

Fr.: extrinsèque   

Not essential or inherent; not forming part of or belonging to a thing. → intrinsic.

Extrinsic, from L.L. extrinsecus "outward," from extrim- + secus "beside," from sequi "to follow."

Borungin, from borun "out, the outside" (Mid.Pers. bêron, from "outside, out, away" + rôn "side, direction;" Av. ravan- "(course of a) river") + -gin adj. suffix, contraction of âgin "filled."

extrinsic photoconductivity
  شیدهازندگی ِ برونگین   
šidhâzandegi-ye borungin

Fr.: photoconductivité extrinsèque   

Photoconductivity due to the addition of impurities or external causes.

extrinsic; → photoconductivity.

Šidhâzandegi, → photoconductivity; borungin, → extrinsic.

extrinsic semiconductor
  نیم‌هازا‌ی ِ برونگین   
nimhâzâ-ye borungin

Fr.: semiconducteur extrinsèque   

A semiconductor, such as silicon, whose responsive properties can be altered by the addition of impurities. Copper- and mercury-doped germanium are both examples of this semiconductor material.

extrinsic; → semiconductor.

extrinsic variable star
  ستاره‌ی ِ ورتنده‌ی ِ برونگین   
setâre-ye vartande-ye borungin

Fr.: étoile variable extrinsèque   

A star whose variation in apparent brightness is not due to changes in the star itself but to some external cause, such as eclipsing by a companion.

extrinsic; → variable; → star.

eye
  چشم   
cašm (#)

Fr.: œil   

The organ of vision that detects light.

O.E. ege (Mercian), eage (W. Saxon), from P.Gmc. *augon, from PIE *okw- "to see;" cf. Av. aši- "(both) eyes;" Skt. áksi- "eye;" Gk. osse "(both) eyes;" Goth. augo; O.C.S. oko; Lith. akis; L. oculus; Arm. ac-kh "eye."

Cašm, from Mid.Pers. cašm, Av. cašman- "eye," ākas- "to look," from prefix ā- + Proto-Iranian *kas- "to look, appear," cf. Skt. cáksus- "seeing."

eye relief
  چشم‌نهاد   
cašm nehâd

Fr.: dégagement oculaire   

The distance between the eyepiece of a telescope and the location of the exit pupil. This is where the observer's eye should be positioned to see the entire field of view of the eyepiece. Also termed eye distance.

eye; relief, from M.E. relef, from O.Fr. relief "assistance," from relever "to raise," from L. relevare "to raise, alleviate," from re- intensive prefix, + levare "to lift up, lighten."

Cašm nehâd "eye position," from cašm, → eye, + nehâd "position, placing, posture," contracted form of nehâdan "to place, put;" Mid.Pers. nihâtan; Av. ni- "down; into," → ni-, + dā- "to put; to establish; to give," dadāiti "he gives;" cf. Skt. dadāti "he gives;" Gk. didomi "I give;" L. do "I give;" PIE base *do- "to give."

eye safety
  گزند ِ چشم، زیلگی ِ ~   
gazand-e cašm, zilegi-ye ~

Fr.: sécurité oculaire   

The necessary precautions that must be taken in order to avoid damaging the eyes when watching a → solar eclipse. The only time that the Sun can be viewed safely with the naked eye is during a → total eclipse, when the Moon completely covers the disk of the Sun. It is never safe to look at a → partial eclipse or → annular eclipse, or the partial phases of a total solar eclipse, without the proper equipment and techniques. Even when 99% of the Sun's surface (the → photosphere) is obscured during the partial phases of a solar eclipse, the remaining crescent Sun is still intense enough to cause permanent retinal damage, especially when viewed through binoculars or other optical aids (F. Espenak, NASA).

eye; safety, M.E. sauvete, from O.Fr. salvetet, from M.L. salvitatem "safety," from L. salvus, cognate with Pers. har "all, each, every," → holo-.

Gazand "damage, injury," Mid.Pers. wizend, ultimately from *ui-jan-, from *ui- "apart, away from," → expand, + *jan- "to beat, strike," cf. Pers. zan-, zadan "to beat, strike," → beat; cašm, → eye
Zilegi, → security.

eyeglasses
  عینک   
eynak (#)

Fr.: lunettes   

A device consisting of a pair of glass or plastic lenses worn in a frame in front of the eyes to help correct imperfect vision or protect the eyes from light, dust, and the like. Also called glasses, spectacles.

eye; → glass.

Eynak, probably related to âyené "mirror," âbginé "glass" (Mid.Pers. êwênag "mirror," from *âdênak, from Proto-Iranian *ādayanaka-, from prefix ā- + the root of Av. dā(y)- "to see," didāti "sees" (cf. Mod.Pers. didan "to see," Mid.Pers. ditan "to see, regard, catch sight of, contemplate, experience;" O.Pers. dī- "to see;" Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen") + suffix -ak). Other obsolete Pers. equivalents for eyeglasses are cešm-e farangi "Frank/European eye" and âyene-ye farangi "Frank/European glass." And it seems that the oldest mention of eyeglasses in Pers. is by the poet Jâmi (1414-1492), who calls it farangi šišé "Frank/European glass." These paradigms support the relation between eynak and âyené. As for the more recent term sam'ak "hearing aid," which is invoked to relate eynak to eyn (Ar. 'ayn "eye"), it may have been coined on the model of eynak supposing that eyn means "eye."

eyepiece
  چشمی   
cašmi (#)

Fr.: oculaire   

A → lens system, also known as an → ocular, used to → magnify the → image formed by the → objective of a → telescope.

eye; → piece.

Cašmi "ocular," adj. of cašmeye + -i adj. suffix.

F corona
  تاج ِ F   
tâj-e F

Fr.: couronne F   

The exterior part of the → solar corona, illuminated by solar light scattered or reflected by dust particles. The same phenomenon also produces the → zodiacal light, much farther away from the Sun. The dust particles are at most several microns in size and make up a disk stretching over almost 1 solar radius (700,000 km) from the Sun's surface. Unlike electrons, which are responsible for the → K corona, the dust particles move relatively slowly. Thus, the light scattered by them has the same spectrum as the → photosphere and shows the → Fraunhofer lines. The F corona is the most luminous part of the corona at 1.5 solar radii from the Sun's surface (M.S.: SDE).

F referring to the Fraunhofer lines; → corona.

f mode
  ترز ِ f، مُد ِ ~   
tarz-e f, mod-e ~

Fr.: mode f   

Waves that propagate only on the stellar surface. See also: → oscillation mode; → g mode; → p mode.

f referring to → fundamental; → mode.

F ring
  حلقه‌ی ِ F   
halqe-ye F

Fr.: anneau F   

The → Saturn's ring, with a width of 30-500 km, lying just outside of the → A ring, at 140,210 km from the center of Saturn.

ring.

f(R) gravity
  گرانی ِ (R)f   
gerâni-ye f(R)

Fr.: gravité f(r)   

An extension of Einstein's → general relativity derived from relaxing the hypothesis that the → Hilbert-Einstein action for the → gravitational field is strictly linear. This was done by replacing the → Ricci scalar, R, with a non-linear function of R:
S = (1/2κ)∫d4x (-g)1/2f(R) + Sm,
where κ ≡ 8πG and Sm is the matter part of the action. The case of f(R) = R represents the simplest type of f(R) gravity theories. The discovery of → dark energy in 1998 stimulated the idea that → cosmic acceleration today may originate from some modification of gravity to general relativity. Dark energy models based on f(R) theories have been extensively studied as the simplest modified gravity scenario to realize the late-time acceleration. There are three versions of f(R) modified gravity: metric (or second order) formalism, Palatini (or first order) formalism, and metric-affine gravity.

f(R), function of the → Ricci scalar; → gravity.

f-number
  عدد ِ کانونی   
adad-e kânuni (#)

Fr.: nombre d'ouverture   

Same as → focal ratio.

f, from → focal; → number.

F-type star
  ستاره‌ی ِ گونه‌ی ِ F   
setâre-ye gune-ye F

Fr.: étoile de type F   

A star whose spectrum is characterized by strong → absorption lines of ionized → calcium, Ca II (→ H and K lines), which become much stronger than the hydrogen lines of the → Balmer series. A multitude of fainter metallic lines are also present. Ca II lines strengthen to later types. → Main sequence F stars, of which → Procyon is an example, have a → surface temperature of 6,000 to 7,400°C and a mass of 1.1 to 1.4 → solar masses (Habets & Heintze, 1981, AASS 46, 193).

B, letter of alphabet used in the → Harvard classification; → type; → star.

Faber-Jackson relation
  بازانش فیبر-جکسون   
bâzâneš-e Faber-Jackson

Fr.: relation Faber-Jackson   

An empirical power-law correlation between the luminosity (L) and the velocity dispersion of stars (σ) in the center of a elliptical galaxies. The original relation can be expressed mathematically as: L ∝ σγ, where the index γ is observed to be approximately equal to 4, but depends on the range of galaxy luminosities that is fitted. → Tully-Fisher relation.

After the astronomers Sandra M. Faber and Robert Earl Jackson, who first noted this relation in 1976 (ApJ 204, 668); → relation.

fable
  افسانه   
afsâné (#)

Fr.: fable   

1) A short tale to teach a moral lesson, often with animals or inanimate objects as characters.
2) A story not founded on fact.
3) A story about supernatural or extraordinary persons or incidents; legend (Dictionary.com).

M.E. able, fabel, fabul, from O.Fr. fable "story, fable, tale; drama, play, fiction; lie, falsehood," from L. fabula "story, story with a lesson, tale, narrative, account; the common talk, news," literally "that which is told," from fari "speak, tell," from PIE root *bha- "speak."

Afsâné, from Proto-Ir. *abi-sanhana-, from *sanh- "to declare, explain;" cf. O.Pers. θanh- "to declare, say;" Av. səngh- "to declare;" → speech.

Fabry-Perot interferometer
  اندرزنش‌سنج ِ فابری-پرو   
andarzaneš-sanj-e Fabry-Perot

Fr.: interféromètre Fabry-Pérot   

A type of interferometer wherein the beam of light undergoes multiple reflections between two closely spaced partially silvered surfaces. Part of the light is transmitted each time the light reaches the second surface, resulting in multiple offset beams which can interfere with each other. The large number of interfering rays produces an interferometer with extremely high resolution, somewhat like the multiple slits of a diffraction grating increase its resolution.

The design was conceived by French physicists Charles Fabry (1867-1945) and Alfred Pérot (1863-1925) in the late nineteenth century; → interferometer.


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