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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

<< < -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 > >>

Number of Results: 12948 Search : far
uranium oxide
  اکسید ِ اورانیوم   
oksid-e urâniyom

Fr.: oxyde d'uranium   

A chemical compound made up of → uranium and → oxygen. The most common forms of uranium oxide are U3O8 and UO2. Both oxide forms are solids that have low solubility in water and are relatively stable over a wide range of environmental conditions. Triuranium octaoxide (U3O8) is the most stable form of uranium and is the form most commonly found in nature. → Uranium dioxide (UO2) is the form in which uranium is most commonly used as a → nuclear reactor fuel. At ambient temperatures, UO2 will gradually convert to U3O8.

uranium; → oxide.

uranium-233
  اورانیوم-۲۳۳   
urâniyom-233

Fr.: uranium-233   

A → fissile isotope bred by the → fertile isotope thorium-232. It is similar in weapons quality to → plutonium-239.

uranium.

uranium-235
  اورانیوم-۲۳۵   
urâniyom-235

Fr.: uranium-235   

The only naturally occurring → fissile isotope. Natural uranium has 0.7 percent of 235U; light water reactors use about 3 percent and weapons materials normally consist of 90 percent of this isotope.

uranium.

uranium-238
  اورانیوم-۲۳۸   
uranium-238

Fr.: uranium-238   

A → fertile isotope from which → plutonium-239 can be bred. It comprises 99.3 percent of natural uranium.

uranium.

Uranus
  اورانوس   
Urânus (#)

Fr.: Uranus   

The seventh planet from the Sun and the third largest, discovered by William Herschel in 1781. It has a diameter about 51,100 km, four times that of the Earth, and a mass 14.5 times Earth's mass. Uranus orbits the Sun at a distance over 19 times the Earth-Sun distance. Although it takes about 84 years for Uranus to make a revolution, it completes a fast rotation in only 17 and a half hours. Unlike the other planets, its axis of rotation lies mostly in the plane of the Solar System. Uranus is internally less active than the other giant planets, which added to its larger distance from the Sun, makes it colder. It has a dense atmosphere made of mostly molecular hydrogen (83 percent) and helium (15 percent), with two percent methane and traces of acetylene and other hydrocarbons. The planet's greenish-blue color is due to light scattering as in Earth's sky and the absorption of red light by its small amount of atmospheric methane. Uranus has a ring system and 27 known satellites.

L. Uranus, from Gk. Ouranos "heaven." In Gk. mythology he was the the primeval sky god, and responsible for both the sunshine and the rain. He was the son and husband of Gaia, the goddess of the Earth and the father of Titans.

Urca process
  فراروند ِ اورکا   
farâravand-e Urkâ

Fr.: processus Urca   

A cycle of nuclear reactions, primarily among the iron group of elements, accompanied by a high rate of neutrino formation. Neutrinos carry away energy quickly leading to the cooling of the stellar core and a dramatic drop in the pressure. Due to this process in pre-supernova stars, the core becomes unable to support the weight of the overlying layers. These layers collapse onto the core and subsequently rebound and escape in the supernova explosion.

Named for the de Urca Casino in Rio de Janeiro, by George Gamow and Mario Schönberg, who first studied this process. Gamow is reported to have pointed to the similarity between the disappearance of money in the crowded gambling rooms of the Casino and the disappearance of electron energy into invisible neutrinos; → process.

urge
  ۱) گرژیدن؛ ۲) گرژ   
1) garžidan; 2) garž

Fr.: 1) pousser, exhorter, presser; 2) désir ardent, forte envie   

1a) To push or force along; impel with force or vigor.
1b) To drive with incitement to speed or effort.
1c) To impel, constrain, or move to some action.
2) An act of urging; impelling action, influence, or force; impulse (Dictionary.com).

From L. urgere "to press hard, push forward, drive, compel,," from PIE root *ureg- "to push, shove, drive;" cf. Lith. verziu "tie, fasten, squeeze," vargas "need, distress;" O.C.S. vragu "enemy;" Gothic wrikan "to persecute;" O.E. wrecan "avenge; drive, hunt, pursue;" E. wreak "to inflict, to cause;" Av. uruuaj- "to walk," see below.

Garžidan, from Proto-Ir. *uraj- "to go forth" (Cheung 2007; on the model of *urad- "to soften," Baluchi grast "to cook in oil or water"); cf. Av. uruuaj- "to go forth, walk;" cf. Kurd. guš, gušin (?) "to press, squeeze, shake;" Skt. vraj- "to stride, walk, proceed;" cognate with L. urgere, as above (Cheung 2007).

urgency
  گرژانش، گرژانی   
garžâneš, garžâni

Fr.: urgence   

The quality or state of being urgent; imperativeness; insistence.

Noun from → urgent.

urgent
  گرژان   
garžân

Fr.: urgent   

Compelling or requiring immediate action or attention; imperative; pressing (Dictionary.com).

Adj. from → urge.

Ursa Major
  خرس ِ بزرگ   
Xers-e Bozorg (#)

Fr.: Grande Ourse   

The Great Bear. An extensive and prominent constellation in the region of the north celestial pole, at approximately 10h 40m right ascension, +56° declination. The seven brightest stars of Ursa Major are known as the → Big Dipper. The region contains the planetary → Owl Nebula and the spiral galaxies M81 and M82. Abbreviation: UMa, Genitive: Ursae Majoris.

Ursa,from L. ursus "bear," cognate with Pers. xers, as below; Major irregular comparative adj. of magnus "large, great," cognate with Pers. meh "great, large" (Mid.Pers. meh, mas; Av. maz-, masan-, mazant- "great, important," mazan- "greatness, majesty," mazišta- "greatest;" cf. Skt. mah-, mahant-; Gk. megas; PIE *meg- "great").

In Gk. mythology, Zeus falls in love with the nymph Callisto, and they have a son named Arcus. To hide Callisto from the wrath of his wife, Hera, Zeus changed her into a bear. Later on, when Arcus saw the bear Callisto, drew his bow and prepared to shoot her. To prevent Arcus from killing his mother, Zeus placed them together in the sky as the Big Bear and the Little Bear.

Xers "bear," dialectal Tabari ; Mid.Pers. xirs, Av. arša- "bear;" cf. Skt. rksa- "bear;" Gk. arktos; L. ursus; PIE base *rtko- "bear;" bozorg "large, magnificient, great;" Mid.Pers. vazurg "great, big, high, lofty;" O.Pers. vazarka- "great;" Av. vazra- "club, mace" (Mod.Pers. gorz "mace"); cf. Skt. vájra- "(Indra's) thunderbolt," vaja- "strength, speed;" L. vigere "be lively, thrive," velox "fast, lively," vegere "to enliven," vigil "watchful, awake;" P.Gmc. *waken (Du. waken; O.H.G. wahhen; Ger. wachen "to be awake;" E. wake); PIE base *weg- "to be strong, be lively."

Ursa Major star cluster
  خوشه‌ی ِ خرس ِ بزرگ   
xuše-ye Xers-e Bozorg (#)

Fr.: amas de la Grande Ourse   

A moving star cluster containing over 100 stars that are scattered over an area of sky more than 1,000 minutes of arc in diameter. The five brightest stars of the → Big Dipper as well as → Sirius belong to this → dynamical stream.

Ursa Major; → star; → cluster.

Ursa Minor
  خرس ِ کوچک   
Xers-e Kucak (#)

Fr.: Petite Ourse   

The Lesser Bear. A constellation situated in the northern hemisphere, at about 15h right ascension, +79° declination. Its two brightest stars, both of 2nd magnitude, are → Polaris, the present pole star, and → Kochab. Abbreviation: UMi, Genitive: Ursae Minoris.

Ursa,from L. ursus "bear," cognate with Pers. xers, as below; Minor "smaller, less," from minus related to L. minuere "make small;" cf. Gk. meion "less," minuthein "to lessen;" Skt. miyate "diminishes, declines;" O.E. minsian "to diminish;" PIE base *mei- "small."

Xers "bear," dialectal Tabari ; Mid.Pers. xirs, Av. arša- "bear;" cf. Skt. rksa- "bear;" Gk. arktos; L. ursus; PIE base *rtko- "bear;" kucak "small;" Mid.Pers. kucak "small," related to kutâh "short, small, little," kudak "child, infant," kutulé, → dwarf; Mid.Pers. kôtâh "low," kôtak "small, young; baby;" Av. kutaka- "little, small."

Ursa Minor system
  راژمان ِ خرس ِ کوچک   
râžmân-e Xers-e Kucak

Fr.: galaxie naine d'Ursa Minor   

A dwarf spheroidal galaxy of faint luminosity that is a member of the Local Group.

Ursa Minor; → system.

Ursids
  خرسیان   
Xersiyân

Fr.: Ursides   

An annual → meteor shower whose → radiant lies in the constellation → Ursa Minor and is active between December 17 and December 24. The shower usually peaks around December 23.

Ursa Minor; → -ids.

Urvara
  اوروارا   
Urvara

Fr.: Urvara   

An → impact cratrer on → Ceres which is the third largest crater on this → dwarf planet. Urvara is located south of → Occator and is about 160 km wide and 6 km deep. It has a prominent central peak that is about 3 km high.

Named for the ancient Indo-Iranian personification of fertility, Av. urvarā- "plant," often defied, Skt. urvárā- "land, soil, fertile field."

user
  کاربر   
kârbar (#)

Fr.: utilisateur   

A person who uses or exploits something, such as a computer.

From use; M.E. usen from O.Fr. user "to use, employ," from V.L. *usare "to use," from L. uti "to use."

Kârbar "user," from bé kâr bordan "to use."

users committee
  کمیته‌ی ِ کاربران   
komite-ye kârbarân

Fr.: comité des utilisateurs   

A committee whose members represent the astronomers who use the facilities of an observatory and which is intended to improve the interaction between the observatory and the users.

user; committee, M.E., from O.Fr. commettre "to commit," from L. committere "to bring together," from → com- + mittere "to put, send."

Komité, loan from Fr.; kârbarân plural of kârbaruser.

utilitarian
  هوده‌مند   
hudemand

Fr.: utilitaire   

1) Of, relating to, or in the interests of utility.
2) Of, characterized by, or adhering to → utilitarianism.

Coined by Jeremy Bentham (1748-1832) from → utility + -arian.

utilitarianism
  هوده‌مندی‌باوری، هوده‌مندی‌گرایی   
hudemandibâvari, hudemandigerâyi

Fr.: utilitarisme   

Philosophy: A doctrine according to which the virtue of a thing or an action is determined by its utility. The goal of utilitarian ethics is to promote the greatest happiness for the greatest number of people. The founders of this philosophical school were Jeremy Bentham (1748-1832) and James Mill (1773-1836).

utilitarian; → -ism.

utility
  ۱) هوده‌مندی؛ ۲) هوده‌مند   
1) hudemandi; 2) hudemand

Fr.: 1) utilité; 2) utilitaire   

1) The state or quality of being useful; usefulness.
2) Having, or made for, useful practical purposes. → utility software.

M.E. utilite, from O.Fr. utilite "usefulness," earlier utilitet, from L. utilitatem "usefulness, profit," from utilis "usable," from uti "to use."

Hudemandi, from hudemand "utile," from hudé "use" (as in bihudé "useless, vain, absurd"), from Mid.Pers. hudâg "good, useful, beneficent;" Av. hūdā- "doing good, producing wealth," from hū-, hu-, → eu-, + Av./O.pers. dā- "to give, grant, put," dadāiti "he gives;" Mid.Pers./Mod.Pers. dâdan "to give, put" (cf. Skt. dadáti "he gives;" Gk. tithenai "to place, put, set," didomi "I give;" L. dare "to give, offer;" Rus. delat' "to do;" O.H.G. tuon, Ger. tun, O.E. don "to do;" PIE base *dhe- "to put, to do") + -mand(i)

<< < -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 > >>