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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc coh col col col Com com com com com com com com Com con con con con con con con con con con con con coo Cor Cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>

Number of Results: 13116 Search : far
task
  تش   
taš

Fr.: tâche   

1) A definite piece of work required to be done as a duty or routine job.
2) A matter of considerable labor or difficulty.
3) In computer programming, a basic unit of programming that an → operating system controls.

M.E., from M.L. tasca, metathetic variant of taxa "tax," from taxare "evaluate, estimate, handle," also "censure, charge."

Taš, created from Proto-Ir. root *taš- "to make, construct; to cut;" cf. Av. tāš- "to make, construct; to cut;" O.Pers. (ham)taxš- "to work with, effect;" Mid.Pers. tâš- "to cut, cleave; create;" Mod.Pers. taš, tišé "hatchet, axe, adze," tarâšidan "to shave;" Ossetic I. dasyn/dast "to shave;" Munji tiž-, Yidgha tiž- "to shear;" Pash. toq "to shave;" cf. Skt. taks- "to form (by cutting), to build, prepare;" Gk. tekton "carpenter."

task manager
  گنارگر ِ تش، تش-گنارگر   
gonârgar-e taš, taš-gonârgar

Fr.: gestionnaire de tâches   

A → software → utility that enables a → user to view each of the tasks currently running on the → computer, each of the → processes, and the overall performance of the computer.

task; → manager.

Taurids
  گاویان   
Gâviyân

Fr.: Taurides   

An annual → meteor shower occurring in the constellation → Taurus. There are actually two distinct Taurid meteors: the South and North Taurids. The Southern peaks around 10 October and the Northern about 12 November. The Taurid meteor shower is created by debris left behind by → Encke's comet.

Taurus; → -ids.

Taurus
  گاو   
Gâv (#)

Fr.: Taureau   

Th Bull. A large constellation of the → Zodiac, in the northern hemisphere at about 4h 20m right ascension, 16° north declination. Alpha Tauri or → Aldebaran is among the twenty brightest stars in the sky. Taurus contains several star clusters, including the → Pleiades and → Hyades. The famous → Crab nebula is situated to the west of Zeta Tauri. Abbreviation: Tau; Genitive: Tauri.

From L. taurus "bull," from PIE *tauro- "bull" (cf. Gk. tauros; O.C.S. turu "bull, steer;" Lith. tauras "aurochs;" O.Pruss. tauris "bison"), often said to be from PIE *steu-ro- "be big, be strong, be sturdy" (cf. Pers. sotur, Mid.Pers. stôr "horse, mount; large cattle;" Av. staora- "bovine animals;" O.Icelandic stjôrr; Goth. stiur "young bull;" O.E. steor; E. steer).

Gâv "bull, ox, cow;" Mid.Pers. gâw "ox, bull, cow; Taurus;" Av. gao- "cow, ox, bull;" cf. Skt. gaus; Gk. bous "ox;" L. bov-; Armenian kov; O.E. cu; E. cow; PIE base *gwou- "ox, bull, cow."

tautology
  همانگویی   
hamânguyi (#)

Fr.: tautologie   

1) Needless repetition of an idea, especially in words other than those of the immediate context, without imparting additional force or clearness, as in "lifeless dead."
2) A → proposition that is → always  → true. On a → truth table a tautology is a → sentence that is true for every possible → truth value of its constituent parts.

L.L. tautologia "representation of the same thing in other words," from Gk. tautologia, from tautologos "repeating what has been said," from tauto "the same" (contraction of to auto "the same," from to "the" + → auto + -logos "saying," related to legein "to say," → -logy.

Hamân "same" (Mid.Pers. ham "same; also; together," → com-) + ân "that."

Taylor column
  ستون ِ تیلر   
sotun-e Taylor

Fr.: colonne de Taylor   

A phenomenon in which the relative motion of a homogeneous rotating liquid tends to be the same in all planes perpendicular to the axis of rotation. When a rotating fluid comes into contact with a submerged object, the fluid flows around it as if it were a cylinder extending the entire depth of the fluid parallel to the axis of the system.

Taylor number; → column.

Taylor number
  عدد ِ تیلر   
adad-e Taylor

Fr.: nombre de Taylor   

A → dimensionless number indicating the relative importance of the → centrifugal and → viscous forces in the → Taylor-Couette flow. It is also called rotational Reynolds number. Its value depends on the length scale of the convective system, the rotation rate, and → kinematic viscosity. The Taylor number Ta is expressed by Ω2Rd32 where Ω is the → angular velocity of the inner cylinder, R = (R1 + R2)/2 is the mean radius of the two cylinders, d = R2 - R1 is the distance between the cylinders, and ν is → kinematic viscosity. If Ta is equal or greater than one, the rotational effects are significant.

Named after Geoffrey Ingram Taylor (1886-1975), a British physicist, mathematician, and expert on fluid dynamics and wave theory; → number.

Taylor series
  سری ِ تیلر   
seri-ye Taylor (#)

Fr.: série de Taylor   

A series expansion of an infinitely differentiable function about a point a: Σ (1/n!) (x - a) n f n (a), where fn(a) is the n-th derivative of f at a, and the sum over n = 0 to ∞. If a = 0 the series is called a → Maclaurin series.

Named for the English mathematician Brook Taylor (1685-1731); → series.

Taylor-Couette flow
  تچان ِ تیلر-کویءت   
tacân-e Taylor-Couette

Fr.: écoulement de Taylor-Couette   

The → Couette flow between two concentric cylinders with fluid filling the annular region. The flow is generated by the relative rotation of the two cylinders. Under some physical conditions the flow may undergo the → Taylor-Couette instability.

Taylor number; → flow.

Taylor-Couette instability
  ناپایداری ِ تیلر-کویءت   
nâpâydâri-ye Taylor-Couette

Fr.: instabilité de Taylor-Couette   

A hydrodynamic instability in the → Taylor-Couette flow that arises when the rotation velocity of the fluid exceeds a critical value. The instability arises for → Taylor numbers larger than about 1700. At the beginning the fluid elements will move in simple rolls, but turbulence in the form of complex spirals will appear with increasing rotation velocity.

Taylor-Couette flow; → instability.

Taylor-Goldstein equation
  هموگش ِ تیلر-گلدشتاین   
hamugeš-e Taylor-Goldstein

Fr.: équation de Taylor-Goldstein   

Fluid mechanics: A second order differential equation that governs the vertical structure of a perturbation in a stratified parallel flow.

Named after G. I. Taylor (Effect of variation in density on the stability of superposed streams of fluid, 1931, Proc. R. Soc. Lond. A, 132, 499), → Taylor number, and S. Goldstein (On the stability of superposed streams of fluids of different densities, 1931, Proc. R. Soc. Lond. A, 132, 524); → equation.

Taylor-Proudman theorem
  فربین ِ تیلر-پراؤدمن   
farbin-e Taylor-Proudman

Fr.: théorème de Taylor-Proudman   

In a rapidly rotating fluid, the fluid velocity is constant along any line parallel to the axis of rotation.

Taylor number; Joseph Proudman (1888-1975), British mathematician and oceanographer.

teach
  آموختن   
âmuxtan (#)

Fr.: enseigner   

To impart knowledge or skill to; give instruction to.

M.E. techen, O.E. tæcan; cf. O.H.G. zihan, Ger. zeihen "to accuse," Goth. ga-teihan "to announce;" cognate with Pers. dis, → form.

Âmuxtan, âmuz- "to teach; learn;" Mid.Pers. hammoxtan, hammoz- "to teach; learn;" cf. Sogd. muck "teacher;" Choresmian mxs "to learn," mwcy "to teach, instruct;" Proto-Iranian *mauc- "to learn; teach."

technetium
  تکنتیوم   
teknetium (#)

Fr.: technétium   

A radioactive chemical element which does not exist naturally on Earth; symbol Tc. Atomic number 43; mass number of most stable isotope 98; melting point 2,200°C; boiling point 4,877°C. Technetium is synthesised via the → s-process in deep layers of → asymptotic giant branch stars.

From the Gk. technetos "artificial," initially called masurium.

technique
  تشنیک، فن   
tašnik, fann

Fr.: technique   

The body of specialized procedures and methods used in any specific field, especially in an area of applied science.

From Fr. technique "formal practical details in artistic expression," noun use of adj. technique "of art, technical," from Gk. tekhnikos, from tekhne "art, skill, craft, method, system;" cognate with Pers. tarâš- "to cut, hew; scape; shave," tišé "axe," as below.

Tašnik, related to Pers. tarâšidan "to cut, hew; scape; shave;" Mid.Pers. tâšitan "to cut, cleave; create by putting together different elements;" from Av. taš- "to cut off, fashion, shape, create," taša- "axe" (Mod.Pers. taš, tišé "axe;" tarâšidan "to shave"), tašan- "creator;" cf. Skt. taks- "to fom by cutting, tool, hammer, form," taksan- "wood-cutter, carpenter;" Gk. tekton "carpenter," tekhne "art, skill, craft, method, system;" L. textere "to weave;" PIE *teks- "to fashion."
Fann or fan, from Pers. fan "way, manner, mode, art, science," related to Mod/Mid.Pers. pand "path, advice, counsel;" Khotanese pande "road, path;" Ossetic fœndœg "path, road;" O.Pers. paθi- "path, way;" Av. paθ- "path, way," variants paθi-, paθā-, pantay-; cf. Skt. pánthā- "road, path, course;" Gk. patos "path, way," pontos "sea;" L. pons "bridge, path;" P.Gmc. *finthanan "to find;" E. find; PIE base *pent- "to go, to tread."

technology
  تشنیک‌شناسی، فناوری   
tašnik-šenâsi (#), fanâvari (#)

Fr.: technologie   

The use of scientific knowledge for the creation and development of devices, machines, and techniques to achieve a commercial, industrial, or scientific objective.

From Gk. tekhnologia "systematic treatment of an art, craft, or technique," originally referring to grammar, from tekhno-, from tekhne, → technique, + → -logy.

tectonics
  سازانیک   
sâzânik

Fr.: tectonique   

The science or art of assembling, shaping, or ornamenting materials in construction; the constructive arts in general. → plate tectonics

L.L. tectonicus, from Gk. tektonikos "pertaining to building," from tekton (genitive tektonos) "builder, carpenter," → technique.

Sâzânik, from sâzân pr.p. of sâz-, sâxtan "to build, make, fashion; to adapt, adjust, be fit" (Mid.Pers. sâxtan, sâz-, Manichean Parthian s'c'dn "to prepare, to form;" Av. sak- "to understand, to mark," sâcaya- (causative) "to teach") + -ik, → -ics.

Teide 1
  تایده-۱   
Teide 1

Fr.: Teide 1   

The first genuine → brown dwarf, discovered in 1995. It is located in the → Pleiades open cluster at approximately 400 → light-years. Teide 1 is a faint object of apparent magnitude I = 19.03, with a late → M dwarf spectral type (M8), corresponding to 55±15 → Jupiter masses (Rebolo et al. 1995, Nature 377, 129).

Named for Observatorio del Teide, Teide Observatory (Tenerife, Canary Islands, Spain), where this object was first detected.

tektite
  تکتیت   
tektit (#)

Fr.: tektite   

Small glassy bodies whose chemical composition is unrelated to the geological formation in which they are found. They are found mostly in Australia, Java, Philippines and Indochina. Tektites are now thought to have been produced by the impact of meteorites on the earth's surface.

From Gk. tekt(os) "molten" + -ite a suffix used in the name of minerals and fossils.

tele-
  دور-   
dur- (#)

Fr.: télé-   

A combining form meaning "distant."

From Gk. tele-, combining form of tele "far off, afar, at or to a distance," related to teleos "end, goal, result, perfection."

Dur- "far," from Mid.Pers. dūr "far, distant, remote;" O.Pers. dūra- "far (in time or space)," dūraiy "afar, far away, far and wide;" Av. dūra-, dūirē "far," from dav- "to move away;" cf. Skt. dūrá- "far; distance (in space and time);" PIE base *deu- "to move forward, pass;" cf. Gk. den "for a long time," deros "lasting long."

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc coh col col col Com com com com com com com com Com con con con con con con con con con con con con coo Cor Cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>