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: 12955 Search : far
estimation
  بر‌آوری   
barâvari (#)

Fr.: estimation   

Statistics: The process by which sample data are used to indicate the value of an unknown quantity in a population.

Verbal noun of → estimate.

estimator
  بر‌آور   
barâvar

Fr.: estimateur   

Statistics: Any quantity calculated from the sample data which is used to give information about an unknown quantity in a population. For example, the sample mean is an estimator of the population mean.

Agent noun of → estimate.

estuary
  کشندان   
kešandân (#)

Fr.: estuaire   

1) That part of the mouth or lower course of a river in which the river's current meets the sea's tide.
2) An arm or inlet of the sea at the lower end of a river (Dictionary.com).

From L. aestuarium "a tidal marsh, mud-beds covered by water at high tides; channel inland from the sea," from aestus "boiling (of the sea), tide, heat," from PIE *aidh- "to burn;" cognates: Gk aithein "to burn," Skt. inddhe "burst into flames," O.Irish aed "fire," O.H.G. eit "funeral pile."

Kešandân, literally "site of tides," from kešand, → tide, + -ân a suffix of place and time.

Eta Carinae
  اتا-افزل   
Eta Afzal

Fr.: Eta de la Carène   

The most luminous and the most extensively studied of → Luminous Blue Variables. Known also as HD 93308, it lies in the → Trumpler 16star cluster of the → Carina Nebula and is about 7,500 to 8,000 → light-years away. η Carina probably began its life as a → very massive star with an initial mass of about 150 → solar masses, and has a current estimated mass of about 90-100 solar masses. The difference has been lost in sudden giant eruptions in the past few thousand years. The so-called → Homunculus Nebula results from the mass ejection by η Carinae during its giant outburst around 1843 when it reached a magnitude of -1 and became the second brightest star in the southern sky. About 1880 it reached magnitude 7 and has remained at this level, although with fluctuations. The 1843 event ejected at least 12 solar masses of gas moving at speeds of up to 650 km s-1 with a kinetic energy of almost 1050 erg. The double-lobed remnant has a mass of about 2.5 solar masses. It is divided by a → torus of cold dust (110 K), about 5 → light-years in radius and 15 solar masses, which was ejected in an earlier event some 1000 years ago. There is strong evidence that η Carinae is a → binary system with a period of about 5.5 years and a projected separation less than 30 → astronomical units (about 0.013 arcsec). A colliding-wind binary is suggested by the → hard X-ray spectrum. The main component has an estimated → mass loss rate of 10-3 solar masses per year.

Eta (η), Gk. letter of alphabet; the → Carina constellation.

etch
  باتیزاب‌کندن، اچیدن   
bâ tizâb kandan, ecidan

Fr.: graver à eau forte   

1) To cut, bite, or corrode with an acid or the like; engrave with an acid or the like, as to form a design in furrows that when charged with ink will give an impression on paper.
2) To produce (a design, image, etc.) by this method, as on copper or glass (Dictionary.com).
3) Astro.: To cut or corrode an → iron meteorite with a strong → acid to reveal its hidden → crystalline structure.

From Du. etsen, from Ger. ätzen "to etch," from O.H.G. azzon "to cause to bite, feed," ultimately from PIE root *ed- "to eat;" cf. Av. ad- "to eat;" Mod.Pers. âš "thick brew, soup" (from O.Pers. *āšyā-, Proto-Ir. *HasH- "to eat"); Skt. ad- "to eat;" Gk. edo "I eat;" Lith. edu "I eat;" O.Irish ithim "I eat;" O.E. etan, O.H.G. essan, Ger. essen "to eat."

Bâ tizâb kandan, literally "to dig with acid," from "with," tizâb "acid," kandan "to dig;" ecidan, from E. etch, cognate with Pers. âš, as above.

etching
  تیزاب-کند، اچش   
tizâb-kand, eceš

Fr.: gravure à eau forte   

1) The act or process of making designs or pictures on a metal plate, glass, etc., by the corrosive action of an acid instead of by a burin.
2) An impression, as on paper, taken from an etched plate.
3) The design so produced (Dictionary.com).
4) The act or process of cutting a smooth cross section of a → meteorite with → acid to reveal its → crystal structure.

Verbal noun of → etch.

ethane
  اتان   
etân (#)

Fr.: éthane   

A colorless, odorless → hydrocarbon, C2H6, which occurs with → methane in natural gas.

From eth-, from → ethyl, + -ane a suffix used in names of hydrocarbons of the methane or paraffin series.

ethanol
  اتانول   
etanol (#)

Fr.: éthanol   

An → alcohol having molecular formula C2H5OH. It is a colorless inflammable liquid with a characteristic odor. Ethanol is produced by fermentation of sugar: C6H12O6 → 2 C2H5OH + 2 CO2. It is the active constituent of alcoholic beverages. It is used as a fuel and as a solvent in the extraction of specific substances. It is also known as → ethyl alcohol. Ethanol in the → interstellar medium was first detected toward the → Sagittarius B2 molecular cloud at 82.265, 90.118, and 104.809 GHz (B. Zuckerman et al. 1975, ApJ 196, L99).

Short for → ethyl alcohol.

ether
  اِتِر   
eter (#)

Fr.: ether   

1) Physics: A hypothetical medium filling all space formerly postulated to account for the propagation of → electromagnetic radiation through space. In order to facilitate description and to provide a physical explanation of various phenomena involving action at a distance and electromagnetism, a medium had been postulated with mechanical properties adjusted to provide a consistent theory. In 1887 Michelson and Morley attempted to measure the motion of the Earth through the ether. No such motion was detected. The → Michelson-Morley experiment has been repeated under different conditions, but the hypothesis of a stationary ether through which the Earth moves is not verified.
2) The substance supposed by Aristotle to constitute stars and fill the outer space.
3) Chemistry: A family of organic compounds with the general formula R-O-R', where R and R' are hydrocarbon radicals. In particular diethyl ether, C2H5OC2H5, which is a volatile colorless liquid with a pleasant smell.

From L. æther "the upper air, pure air," from Gk. aither "upper air," from aithein "to burn, shine."

ether drag
  کره‌ی ِ اتر   
kerre-ye eter

Fr.: entraînement de l'éther   

A hypothesis put forward to explain the null measurement of the → ether drift. According to this hypothesis, the Earth somehow drags the ether with it as our planet rotates on its axis and revolves around the Sun. However, the ether drag hypothesis contradicts results from several experiments, including the → aberration of starlight.

ether; → drag.

ether drift
  دلک ِ اتر   
delek-e eter

Fr.: dérive de l'éther   

1) The hypothetical motion of the supposed → ether relative to the Earth. The → Michelson-Morley experiment found no ether drift. An analogy is given by a boat drifting in a fast-flowing river due to the river's current. With the same power, the speed would be slower when sailing across the stream. Moreover, in order to reach directly opposite the starting point, the boat would have to be headed somewhat upstream. See also the → ether drag.
2) The motion of the Earth relative to the → rest frame defined by the → cosmic microwave background radiation.

ether; → drift.

ethno-
  قوم-   
qowm- (#)

Fr.: ethno-   

A combining form meaning "race, culture, people."

From Gk. ethnos "people, nation, class, tribe."

Qowm- loan from Ar. qaum "people, tribe, family."

ethnoastronomy
  قوم‌اخترشناسی   
qowm-axtarshenâsi

Fr.: ethnologie   

The study of the beliefs, interpretations, and practices of specific cultures regarding celestial objects or phenomena. Ethnoastronomy uses the tools and methodologies of → ethnology in the study of astronomical conceptions.

ethno-; → astronomy.

ethnology
  قوم‌شناسی   
qowmšenâsi

Fr.: ethnologie   

The study of specific cultures (ethnic groups) in their different aspects (anthropological, social, cultural, etc.) to establish similarities and disparities between them.

ethno-; → logy.

ethyl
  اتیل   
etil (#)

Fr.: éthyl   

A chemical group, C2H5, produced by removing a hydrogen atom from → ethane. For example, ethyl chloride is C2H5Cl

From Ger. Ethyl, from eth-, from → ether, + -yl a suffixed used in the names of radicals.

ethyl alcohol
  اتیل الکل   
etil alkol (#)

Fr.: éthyl alcool   

Same as → ethanol.

ethyl; → alcohol.

etymology
  ریشه‌شناسی   
riše-šenâsi (#)

Fr.: étymologie   

The study of the origins and history of the form and meaning of → words.

M.E., from L. etymologia, from Gk. etymologia, from etymon "true sense" (neuter of etymos) + logos, → -logy.

Riše-šenâsi, from rišé "root" (dialectal Tabari rexa; Kurd. regez, riše), from Mid.Pers. rêšak "root," maybe ultimately related to PIE *u(e)rad-, although the Skt. offshoot is absent (Gk. rhiza "root;" L. radix, radius "staff;" O.H.G. wurz "plant, herb;" Ger. Wurz; O.E. rot; E. root) + -šenâsi, → -logy.

eu-
  هو-   
hu- (#)

Fr.: eu-   

A prefix meaning "good, well; true, genuine" (eupepsia; eukaryote); opposed to → dys-.

L. from Gk. eu "well," combining form of eus "good" (hu-gies "healthy"); cf. Mid.Pers. hu-; Av. hu- "good;" PIE base *su- "good," see below.

Mid.Pers. hu- "good, well" (hu-boy "sweet-smelling," hu-cihr "beautiful," hu-mânih "good-mindedness"); O.Pers. hu- "good, well" (ukāra- "having good people"); Av. hu-, hū- "well, good, beautiful" (hu-kərp- "well-shapen," hūxta- "well spoken," hu-manah- "good-minded"); Skt. su- "good" (svasti "well-being, good luck," sumánas- "good-minded," sūktá- "well spoken"); Gallic su-; O.S. su-; Welsh hy-; PIE base *su-, as above.

Euclidean
  اقلیدوسی   
Oqlidosi (#)

Fr.: euclidien   

Of or pertaining to Euclid, or his postulates. → Euclidean division, → Euclidean geometry, → Euclidean space, → non-Euclidean geometry.

After the Gk. geometrician and educator at Alexandria, around 300 B.C., who applied the deductive principles of logic to geometry, thereby deriving statements from clearly defined axioms.

Euclidean division
  بخش ِ اقلیدوسی   
baxš-e Oqlidosi

Fr.: division euclidienne   

In arithmetic, the conventional process of division of two → integers. For a → real number a divided by b > 0, there exists a unique integer q and a real number r, 0 ≤ r <b, such that a = qb + r.

Euclidean; → division.

<< < -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 diu dog Dop dou Dra dua dus dwa dyn e-f Ear ecl eco edu eig Ein ela ele ele ele Ele elo emi emp ene Enl env epi equ equ Eri est Euc eva evo exc exc exh Exo exp exp ext ext f(R fac fam fat fee Fer Fib fig fin fir fix fle flu foc for for for fra fre Fre fri fun fuz Gal gal gal Gam gau Gay gen Geo geo geo geo gim glo gov gra gra gra gra gre gro Gun hab hal han Har haz hea hel hel Hen Her het Hig hil hol Hoo hor hou Hub hum hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind Ind inf inf inf inf inn ins ins int int int int int int int int inv ion ion Irr iso iso iso jan jit Jul jus Kel ker kin kni La lam lan Lap las lat Lay Led Len let lif lig lin lin lin liq Lit loc log lon lou low lum lun Lym M d Mag mag mag mag mag mag maj man mar mas mas mat mea mea mec mem mer Mes met met mho mic Mie Mil min mis MKS MOd mol Mon moo mot mul mul myo nak Nas nat neb neg neu neu New New nit noi non non nor nor nuc nuc nul nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi pai Pan par par Par par pas Pav Pel per per per per Per per pha phi pho pho pho phy Pip Pla pla PLA pla ple plu pol pol pol pol pop pos pos pot Pra pre pre pre Pri pri pri pro pro pro pro pro pro pro Pto pul pur qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea rea rec rec red red ref ref reg rel rel rel rep res res res res ret RHB rid rig ris roc Ros rot rub Rut Sag sam sat sca sca Sch sci Sea sec sec see sel sem sen set Sha sha shi shu sid sil sim sin SIS ski Slo smo Soc sol sol sol sol son sou spa spa spe spe spe sph spi spi Spo squ sta sta sta sta Ste ste ste sto str str str sub sub suc sun sup sup sup sup sur Swa syn syn tab tar tel tem ter tes the the the the Tho thr tid tim Tit top tot tra tra TRA tra tre tri tri tru Tun Tus tym Typ ult unb und uni uni uns upp Urs vac van var Vei Ven ver vic Vir vir vis vol W 4 war wat wav wea wed wet wid win WN2 Wol wri xen yok zen zin > >>