An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 12929 Search : far
system manager
  گنارگر ِ راژمان   
gonârgar-e râžmân

Fr.: administrateur de système   

A person in charge of the configuration and administration of a multi-user computer system inside a network.

system; → manager.

system noise
  نوفه‌ی ِ راژمان   
nufe-ye râžmân

Fr.: bruit de système   

The noise in a radio telescope, composed of the receiver noise and the sky noise.

system; → noise.

systematic
  راژمان‌مند   
râžmânmand

Fr.: systématique   

Having, showing, or involving a system, method, or plan.

L.L., from Gk. systematikos; → system; → -ic.

Râžmânvâr, râžmânmand, from râžmân, → system, + -mand suffix of possession.

systematic error
  ایرنگ ِ راژمان‌مند   
irang-e râžmânmand

Fr.: erreur systématique   

The error that is constant in a series of repetitions of the same experiment or observation. Usually, systematic error is defined as the expected value of the overall error. opposite of → random error.

systematic; → error.

systematics
  راژمان‌مندیک   
râžmânmandik

Fr.: systématique, taxinomie   

Biology: The science that deals with the systematic naming and classification of all kinds of organisms.

From → systematic + → -ics.

systemic
  راژمانی   
râžmâni

Fr.: systémique   

Relating to or affecting a system as a whole.

system; → -ic.

systems theory
  نگره‌ی ِ راژمان   
negare-ye râžmân

Fr.: théorie des systèmes   

An interdisciplinary field of science which deals with the nature of complex systems in nature, society, and science, and studies complex parts of reality as systems.

system; → theory.

syzygy
  یوجان   
yujân

Fr.: syzygie   

The alignment of three or more celestial bodies in the same gravitational system along a nearly straight line.
Conjunction or opposition of a heavenly body with the Sun.

From L.L. syzygia, from Gk. syzygia "yoke, pair, union of two, conjunction," from syzygein "to yoke together," from → syn- "together" + zygon "yoke," cognate with Pers. yuq, jug "yoke," as below.

Yujân from yuj "yoke," variants yuq, juh (Mid.Pers. jug, ayoxtan "to join, yoke;" Av. yaog- "to yoke, put to; to join, unite;" cf. Skt. yugam "yoke;" Hittite yugan "yoke;" Gk. zygon "yoke," as above, zeugnyanai "to join, unite;" L. jungere "to join," O.C.S. igo, O.Welsh iou, Lith. jungas O.E. geoc. PIE base *yeug- "to join") + -ân suffix of place and time.

T association
  آهزش ِ T   
âhazeš-e T

Fr.: association T   

A → stellar association containing many → T Tauri stars. Examples include the Taurus-Auriga T association, the nearby → TW Hydrae association, and Vela T1 and T2.

T, letter of alphabet; → association.

T dwarf
  کوتوله‌ی ِ T   
kutule-ye T

Fr.: naine T   

A type of → brown dwarf with an → effective temperature between about 1200 K and 500 K, i.e. colder than the preceding type → L dwarf. The spectra of T dwarfs are characterized by the presence of → methane (CH4) bands in the → near infrared. The presence of these bands, broad H2O features, and H2 collision-induced absorption radically alter the spectral energy distributions of T dwarfs compared to a black body at the same temperature. Hence near-infrared colors become increasingly blue (J - K ~ 0) as compared to L dwarfs. The first T dwarf, called → Gl 229B, was discovered by Nakajima et al. (1995, Nature 378, 463). The spectral classification scheme (subtypes T0 to T9) currently used was defined by Burgasser et al. (2002, ApJ 564, 421).

For the reasoning behind the choice of the letter T, see Kirkpatrick et al. 1993, ApJ 406, 701; → dwarf.

T Tauri
   T-گاو   
T Gâv

Fr.: T Tauri   

The most famous young stellar object, the prototype of → T Tauri stars which is located in the Taurus-Auriga star forming region at a distance of about 140 pc. T Tauri is about 2.4 solar masses and about 7 million years old. Complex structures of shock heated gas indicative of outflows surround the star, both on sub-arcsecond and larger scales. The → accretion rate is estimated to be (3-6) x 10-8 solar masses per year. T Tauri has a companion (about 0.7 arcseconds apart) which is invisible in the optical and has been observed to be strongly variable in infrared. It is an intermediate mass young star (2.5 solar masses) surrounded by a → circumstellar disk. This star is itself a → close binary, the component being a low mass star (0.6 solar masses) also surrounded by circumstellar material.

T, letter of alphabet; Tauri genitive of → Taurus.

T Tauri star
  ستاره‌ی ِ T-گاو   
setâre-ye T-Gâv

Fr.: étoile T Tauri   

A member of a class of young stellar objects of roughly 1 solar mass showing strong → infrared excess emission attributed to → circumstellar disks and found within or close to molecular clouds. T Tauri stars are → protostars in the final stages of formation to become a stable → main sequence star. The nuclear reactions in their core have not yet stabilised and the stars are known for the variability of their brightness. See also → classical T Tauri star, → weak-line T Tauri star.

T Tauri; → star.

T-symmetry
  همامونی ِ زمانی   
hamâmuni-ye zamâni

Fr.: symétrie T   

The symmetry of physical laws under a time reversal transformation.

T for → time; → symmetry.

table
  جدول   
jadval (#)

Fr.: table, tableau   

1) An arrangement of words, numbers, or signs, or combinations of them, in parallel columns, to exhibit a set of facts or relations in a definite, compact, and comprehensive form.
2) In particular, → zij

M.E.; O.E. tabule; O.Fr. table "board, plank, writing table" (cf. O.H.G. zabel, Ger. Tafel), both from L. tabula "a board, plank, table," originally "small flat slab or piece" usually for inscriptions or for games.

Jadval, loan from Ar. jadwal.

tablet
  پرنیک   
parnik

Fr.: tablette   

A flat slab or surface, especially one bearing or intended to bear an inscription, carving, or the like (Dictionary.com).

M.E. tablette, from M.Fr. tablete, diminutive from → table.

Parnik, literally "laminar, resembling a leaf, leaf-like," variant parnix [Dehxodâ] "a stone or marble slab, a plane stone," ultimately from Proto-Ir. *parnika-, from *parn-, *par- "feather; leaf, thin layer;" cf. Av. parəna- "feather," Skt. parna- "feather; leaf (regarded as the plumage of a tree)," Mod.Pers. par(r) "feather; leaf;" PIE *pornos-, *pernom- "feather" (E. fern and Ger. Farn belong to this family). See also → slate.

tachocline
  تنداشیب   
tondâšib

Fr.: tachocline   

A thin → transition  → layer inside → Sun, between the → differentially rotating  → convection zone and the uniformly rotating radiative interior. Discovered through → helioseismology, it has raised considerable interest, but its thinness remains still to be explained. Due to its strong → shear, it is believed to play a crucial role in the generation of the → solar magnetic field.

Tachocline, from tacho- a combining form meaning "speed," → tachyon + → -cline "slope." The term was first coined by Edward A. Spiegel and Jean-Paul Zahn (1992, A&A 265, 106), by analogy to the oceanic → thermocline.

Tondâšib, from tondâ, → velocity, + šib, → -cline.

tachyon
  تاکیون   
tâkion (#)

Fr.: tachyon   

A hypothetical subatomic particle that travels faster than the speed of light.

From tachy- a combining form meaning "swift," from Gk. tachys "swift" + → -on.

tadpole
  وگیز   
vagiz

Fr.: têtard   

The aquatic larva of → frogs and → toads, having internal gills and a tail (TheFreeDictionary).

From M.E. taddepol, from tadde "toad" + polle "head," from M.L.G. or M.Du. pol "head, top."

Vagiz, from Tabari vag "→ frog" + -iz, -ize diminutive suffix (variants -ce, -že, -ak, Mid.Pers -cak).

tadpole orbit
  مدار ِ وگیزی   
madâr-e vagizi

Fr.: orbite en forme de têtard   

A shorter → horseshoe orbit confined to the → Lagrangian points L4 or L5.

tadpole; → orbit.

tail
  دم، دنباله   
dom (#), donbâlé (#)

Fr.: queue   

1) The part that sticks out at the back of an animal's body, and that it can move.
2) Anything resembling such an appendage in form or position.
3) → cometary tail.

M.E.; O.E. tægl, from P.Gmc. *tagla- (cf. O.H.G. zagal, Ger. Zagel "tail," O.N. tagl "horse's tail").

Dom, variant domb, "tail;" Mid.Pers. dumb "tail;" Av. duma- "tail"; donbâlé, from domb + -âlé, -âl resemblance suffix, → -al.

<< < -es -iv -ti 217 a- abe abs abs acc acc ach act act ada adi adv aff agg Alc Alf ali all alp alt Ama amp ana ang ang ann ano ant ant ape apo app aps arc arg arm art ass ast ast ast atm ato att aur aut axi B-t bai Bal bar bar Be bee Bes bi- bif bin bin bio bis bla bli blu Boe Bol bor bou bra bri Bro bum CAI cal Can cap car car cat cat CCD Cel cen CGS cha cha che che chr cir cir civ cla clo clo CMB coa coe coh col col col Com com com com com com com com com con con con con con con con con con con con coo cor cor cor cos cos cos cou cov cra cri cro cry cum cur cyc d'A dar dat DC dea dec dec dec def def deh Del den dep des det dev dia dif dif dif dim dip dir dis dis dis dis dis div dom dou dou dri dup dus dyn dyn ear eas ecl Edd eff Ein Ekm ele ele ele ele ell emb emi enc ene ent eph equ equ equ eru eth eup eve EX exc exe exi exo 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 fus G-t gal gal Gam gas Gau Gem gen geo geo geo gia gla gol gra gra gra gra Gre Gre gui H a haf Hal har har He- hea hel Hel her Her hie hig his hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima imp imp imp inc ind ind ine inf inf Inf inj InS ins int int int int int int int int inv inv ion iro Isl iso iso Jac jet jud jur Kel Kep kil kly L d Lag lam Lap lar lat law Lea len lep lib lig lin lin lin liq lit loc log lon Los low lum lun Lut Lyr mac mag mag mag mag mag maj man Mar mas mas mat mea mec mem mer mes met met met mic mid mil min Mir Miz mod mol mon moo MOS mul mul mut nai nas nat neb neg Neu neu New New Nih noi non non non nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove oxi pac Pal par par Par par pas Pau Pel per per per per per per pha phi pho pho pho phy pip Pla pla pla pla pla Plu Poi pol pol pol pop pos pos pot Pra pre pre pre Pri pri pri pro pro pro pro pro pro pro Pto pul puz qua qua qua qua qui rad rad rad rad rad rad rai ran Ras Ray rea rec rec rec red red ref reg reg rel rel rel rep res res res res rev rhe Rie Rig Rit roe Ros rot Ruf Ryd Sag sam sat sca sca Sch Sco sec sec sec seg sel sem sen set sha SHB sho sib sie sil sim sin sit sky slo sno sod sol sol sol sol sor sou Spa spa spe spe spe sph spi Spi spr sta sta sta sta sta ste ste Ste sto str str sub sub sub suf sun sup sup sup sup sur swo syn sys tak Tay Tel ten ter tet the the the thi Tho thu tid tim toa top tot tra tra tra tra tri tri tro Tru tur twi Typ UBV ult unb uni uni uni up ura uti val var vec Vel ver ver vig vir vis VLT vol wad was wav wav wea wei Whe Wie win WN5 Wol X-r yea You zer zod > >>