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: 12948 Search : far
duality
  دوگانگی   
dogânegi (#)

Fr.: dualité   

The quality or character of being twofold, as the → wave-particle duality.

M.E dualitie, from L.L. dualitas.

Dogânegi, from dogânag + -i.

Dubhe (α Ursae Majoris)
  دبه   
dobbé (#)

Fr.: Dubhé   

The second brightest star in the constellation → Ursa Major with a → visual magnitude of about 1.8. It lies at the front of the → Big Dipper's bowl and with → Merak (Beta UMa) makes the famous → Pointers. α Ursae Majoris is a → supergiant of type K0 IIIa and has a → companion.

From Ar. al-dubb (الدب) "bear," referring to the bear in Gk. mythology.

Dobbé from Ar., as above.

ductile
  رشایند   
rešâyand

Fr.: duvtile   

Describing a substance that exhibits → ductility.

M.E., from L. ductilis, from duct(us), p.p. of ducere "to draw along," → aonduct, + -ilis "-il," a suffix of adjectives.

Rešâyand, literally "capable of becoming string, thread," from reš, as in rešté "thread, line, rope, row," rešmé "string, rope, thread," variants rasan, ras, (Gilaki) viris, related to abrišam "silk;" from reštan, risidan "to spin;" Mid.Pers. rištag "rope, string, thread;" Av. uruuaēs- "to turn around," uruuaēsa- "vortex in water;" Proto-Iranian *uris- "to turn, spin;" cf. Skt. vréśī- "an appellation of waters;" Gk. rhiknos "crooked;" Lith. rišti "tie, bind;" O.H.G. rīho "knee-bend;" âyand agent noun form of âmadan "to come; to become," → elastic.

ductility
  رشایندی   
rešâyandi

Fr.: ductilité   

The property of a metal that allows it to be elongated into wire or threads without fracture. For example, → copper and → silver are highly ductile metals.

ductile; → -ity.

Dulong-Petit law
  قانون ِ دولون-پتی   
qânun-e Dulong-Petit

Fr.: loi de Dulong et Petit   

The product of the → specific heat and → atomic weight of most solid elements at room → temperature is nearly the same. In other words, specific heat is constant for a solid and independent of temperature. Experiment shows that at moderate temperatures this law is satisfied for → crystals with rather simple structure. However, the law fails for crystals with more complex structures. More specifically the law cannot explain the variation of specific heat with temperature. The specific heat drops to zero as the temperature approaches 0 K. This behavior is explained only with the quantum theory. → Debye model.

Named after Pierre L. Dulong (1785-1838) and Alexis T. Petit (1797-1820), French chemists, who proposed the law in 1819. They collaborated in several important investigations, including studies of thermal expansion of gases and of liquids and the specific heats of substances; → law.

Dumbbell Nebula (M27, NGC 6853)
  میغ ِ دمبل   
miq-e dambel

Fr.: Nébuleuse de l'Haltère   

One of the brightest planetary nebulae; it lies in the constellation → Vulpecula at a distance of about 1000 light-years. It was discovered by Charles Messier in 1764.

Dumbbell "a short bar with weights at each end that is used for exercise," from dumb + bell. When viewed in a small telescope, the brighter portion of the nebula shows like a bipolar geometry, hence the name; → nebula.

Dambel loanword from dumbbell, as above; → nebula.

duodecennial
  دوازده‌سالی   
davâzdahsâli (#)

Fr.: duodécennal   

Consisting of twelve → years.

From L. duodecennium, from duodecim "tweleve," from duo, → two, + decem, → ten, + annus "year," → annual.

Davâzdahsâli, from davâzdah "twelve," from do, → two, + dah, → ten + sâl, → year.

duodecennial animal calendar
  گاهشمار ِ دوازده‌سالی ِ جانوری   
gâhšomâr-e davâzdahsâli-ye janevari (#)

Fr.: calendrier duodécennal   

A → lunisolar calendar in which the years are named after each of the following twelve animals: rat, ox, tiger, hare, dragon, snake, horse, sheep, monkey, cock, dog, pig. An animal presides over one year in the twelve-year cycle, which is then repeated. The calendar was/is mainly used by central Asian cultures (Khotanese, Sogdians, Buddhists, Kucheans, Mongols, and Chinese). It was also used in Iran after the Mongol invasion in the thirteenth century.

duodecennial; → animal; → calendar.

duplicate
  ۱) دوتاییدن، دوتا کردن؛ ۲) دوتاکرد   
1) dotâyidan, dotâ kardan; 2) dotâkard

Fr.: 1) faire un double de; 2) double, copie exacte   

1) To make an exact copy of.
2) A copy exactly like an original.

From L. duplicatus, p.p. of duplicare "to double," from duo, → two + plicare "to fold," → multiply.

Dotâyidan, "to double," infinitive from dotâyi, → double.

duplication
  دوتایش، دوتاکرد   
dotâyeš, dotâkard

Fr.: duplication   

An act or instance of duplicating; the state of being duplicated.

Verbal noun of → duplicate.

durability
  پایشمندی، پایندگی   
pâyešmandi, pâyandegi

Fr.: durabilité   

The ability to withstand damage or decay.

durable; → -ity.

durable
  پایشمند، پاینده   
pâyešmand, pâyande

Fr.: durable   

Capable of lasting, enduring; withstanding deterioration.

duration; → -able.

duration
  پایش   
pâyeš

Fr.: durée   

Continuance in time; a period of existence or persistence; length of time during which anything continues.

Noun of action from L. durare "to harden," → during.

Pâyeš, noun of action from pâyidan, → last (v.).

during
  ترپای   
tarpây

Fr.: durant   

In the course of, in the time of, throughout the continuance of.

M.E. Duryng, durand, pr.p. of duren "to last, endure, continue, be or exist," from O.Fr. durer, from L. durare "to harden," from durus "hard;" PIE root *deru- "be firm, solid, steadfast."

Tarpây, literally "lasting over time," from tar- "through, across, over time," variant tarâ-, → trans-, + pây present stem and agent noun of pâyidan, → last (v.).

dust
  غبار، گرد   
qobâr(#), gard (#)

Fr.: poussière   

Tiny pieces of solid material, such as carbon and silicate grains, in the → interstellar medium that are about 0.1-1.0 micron in size. → Dust grains embedded in → molecular clouds may be significantly larger.

O.E. dust, akin to O.H.G. tunst "storm," from P.Gmc. *dunstaz, from PIE base dhem-/dhemə- "to smoke, to blow," cf. Skt. dhūmá "smoke," Mod.Pers. dam "smoke; to blow, breathe," Av. dāδmainya- "blowing up," Gk. thumiao "to fumigate, burn incense," thymos "spirit, mind, soul," L. fumus "smoke," Ossetic dymyn/dumun "to smoke, blow up," Lith. dumai "smoke."

Qobâr, from Ar.; gard "dust," Mid.Pers. gart, gard.

dust analogue
  آناگویه‌ی ِ غبار   
ânâguye-ye qobâr

Fr.: analogue de poussière   

A chemical compound produced in laboratory experiments to simulate real → interstellar dust grains and thus study them.

dust; → analogue.

dust coagulation
  ماسش ِ غبار، رچش ِ ~   
mâseš-e qobâr, roceš-e ~

Fr.: coagulation de la poussière   

A process of formation of → dust grains in → interstellar medium and → protoplanetary disks, in which randomly colliding aggregates may stick together.

dust; → coagulation.

dust devil
  دیو-باد   
div-bâd

Fr.: tourbillon de poussière   

A small but vigorous → whirlwind, usually of short duration, rendered visible by → dust, → sand, and → debris picked up from the ground (Meteorology Glossary, Amer. Meteo. Soc.). See also → dust storm, → dust whirl.

dust; → devil.

dust emission
  گسیل ِ غبار   
gosil-e qobâr

Fr.: émission des poussières   

Thermal emission in infrared from interstellar → dust grains receiving photons. Dust grains absorb ultraviolet and visible light emitted by nearby stars and re-radiate in the infrared wavelengths. Since the infrared light is of lower energy than the ultraviolet/visible light, the difference goes into heating the dust grain. Typical temperatures for interstellar grains are tens of degrees Kelvin.

dust; → emission.

dust feature
  آرنگ ِ غبار   
ârang-e qobâr

Fr.: marque de poussière, signature de ~, motif spectral de ~   

An emission or absorption mark in the spectrum of an astronomical object, the origin of which is attributed to the presence of dust in the object or on the line of sight.

dust; → feature.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu 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 cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>