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: 13009 Search : far
accelerating
  شتابنده   
šetâbandé (#)

Fr.: en accélération   

Moving or proceeding with → acceleration; e.g. → accelerating system; → accelerating Universe.

Verbal adj. from → accelerate.

accelerating expansion of the Universe
  سپانش ِ شتابنده‌ی ِ گیتی   
sopâneš-e šetâbande-ye giti

Fr.: expansion accélérée de l'Univers   

accelerating Universe.

accelerating; → expansion; → Universe.

accelerating system
  راژمان ِ شتابنده   
râžmân-e šetâbandé

Fr.: système en accélération   

A material system that is subject to a constant force in each and every one of its instantaneous points of trajectory.

accelerating; → system.

accelerating Universe
  گیتی ِ شتابنده   
giti-ye šetâbandé (#)

Fr.: univers en accélération   

The deduction based on the observation that the most distant → Type Ia supernovae are fainter than that expected from their → redshifts in a matter-only dominated expanding Universe. The faintness is attributed to larger distances resulting from an accelerating Universe driven by presence of a new component with strongly negative pressure. This component that makes the Universe accelerate is named → dark energy. The deceleration or acceleration of an expanding Universe, given by the general relativistic equation, is: R../R = -(4/3)πGρ(1 + 3w), where R is the linear → cosmic scale factor of the expanding Universe, G the → gravitational constant, ρ the mean density of the Universe, and w the → equation of state parameter representing dark energy. The expansion accelerates whenever w is more negative than -1/3. The Nobel Prize in Physics 2011 was awarded to the initiators of this concept, Saul Perlmutter, Brian P. Schmidt, and Adam G. Riess, for their discovery of the accelerating expansion of the Universe through observations of distant supernovae. See also the original paper: Perlmutter et al. 1999, ApJ 517, 565.

accelerating; → universe.

acceleration
  شتاب   
šetâb (#)

Fr.: accélération   

The rate at which the velocity of an object changes with time.

Acceleration, from accelerate, from L. accelerare "quicken," from → ad- "to" + celerare "hasten," from celer "swift" (cf. Skt. car, carati "to move, go, drive," Gk. keles "fast horse, horse race," Av. kar- "to walk, move, go around," Mod.Pers. cal, calidan "to move, to go, to walk" (jald? "quick, active, brisk"), Gilaki/Hamadâni jal "quick, fast,"Lori žil "motion, impulse"); PIE *kel- "to drive, set in swift motion."

Šetâb "quickness, haste, speed," Mid.Pers. ôštâp "hurry, haste," ôštâftan "to hurry, hasten," from *abi.stap-, from abi- " to; in addition to; against" + *stap- "to oppress," Arm. (loanword) štap "haste, trouble."

acceleration of gravity
  شتاب ِ گرانی   
šetâb-e gerâni

Fr.: accélération de la gravité   

The acceleration that an object experiences because of gravity when it falls freely close to the surface of a massive body, such as a planet. Same as → gravitational acceleration.

acceleration; → gravity.

acceleration parameter
  پارامون ِ شتاب   
pârâmun-e šetâb

Fr.: paramètre d'accéleration   

A measure of the departure from a constant rate of the acceleration of the Universe, expressed by: q(t) = R(t)R ..(t)/R .2(t), where R(t) represents the size of the Universe at time t. Traditionally, a negative sign is inserted in the above equation for the → deceleration parameter.

acceleration; → parameter.

accelerator
  شتابگر   
šetâbgar (#)

Fr.: accélérateur   

A machine which accelerates charged atomic (ions of various elements) or subatomic particles (usually electrons and protons) to high energies. → cyclotron; → synchrotron.

Accelerator, from accelerate, → acceleration, + -or agent suffix, from M.E. -or, -our, from O.F. -eor, -eur, from L. -or.

Šetâbgar, from šetâbacceleration + -gar agent suffix, → -or.

acceptor
  پذیرنده   
pazirandé (#)

Fr.: accepteur   

In a → semiconductor, an → impurity which creates a hole in the electronic structure of the crystal and causes p conduction. → donor; → impurity.

M.E. acceptour, from O.Fr. acceptour, from L. acceptor, from acceptare "take or receive willingly," from accipere "to receive," from → ad- "to" + capere "to take, hold, seize," PIE base *kap- "to grasp" (cf. Skt. kapati "two handfuls," Gk. kaptein "to swallow," Goth. haban "have, hold," O.E. habban "to have, hold," probably Mod.Pers. qâp-, qâpidan, kapidan "to seize, rob," Av. haf-, hap- "to keep, observe").

Pazirandé agent noun from paziroftan "to receive, accept, admit," Mid.Pers. padiriftan, padir- "to receive, accept," from Proto-Iranian *pati- + *grab- "to grab, seize, take," Av./O.Pers. grab- "to take, seize;" cp. Skt. grah-, grabh- "to seize, take," graha "seizing, holding, perceiving," M.L.G. grabben "to grab," from P.Gmc. *grab (E. grab); PIE *ghrebh- "to seize."

access
  ۱) دسترسی داشتن؛ ۲) دسترسی   
1) dastrasi dâštan; 2) dastrasi (#)

Fr.: accès   

1) To have the right to connect to a computer or a server and retrieve information.
2) The act or instance of accessing a computer.

M.E. accesse, from O.Fr. acces "onslaught," from L. accessus "a coming to, an approach," p.p. of accedere "to approach, enter upon" from → ad- "to" + cedere "go, move."

Dastrasi "access," from dast "hand" (Mid.Pers. dast; O.Pers. dasta-; Av. zasta-; cf. Skt. hásta-; Gk. kheir; L. praesto "at hand;" Arm. jern "hand;" Lith. pa-žastis "arm-pit;" PIE *ghes-to-) + rasi, verbal noun of rasidan "to attain; to arrive" (Mid.Pers. rasidan "to arrive, to mature;" O.Pers./Av. rasa- present stem of ar- "to move, go or come toward;" cf. Skt. ar-, rcchati "reaches;" Gk. erkhomai "to go, to reach;" L. oriri "to rise"); dâštan "to have, hold, maintain, possess" (Mid.Pers. dâštan; O.Pers./Av. root dar- "to hold, keep back, maitain, keep in mind;" cf. Skt. dhr-, dharma- "law;" Gk. thronos "elevated seat, throne;" L. firmus "firm, stable;" Lith. daryti "to make;" PIE *dher- "to hold, support").

accident
  دشامد   
došâmad (#)

Fr.: accident   

An unexpected and undesirable event; an unforeseen and unplanned event or circumstance.

M.E., from M.Fr., from L. accidentum, pr.p. of accidere "to happen, fall out" from ad- "to" + cadere "to fall."

Došâmad, from doš- prefix meaning "bad, ill, abnormal" (Mid.Pers. duš-, duž-, O.Pers./Av. duš-, duž- "bad, ugly, evil," cognate with Skt. dus-, Gk. → dys- "bad, hard, unlucky") + âmad, from âmadan "to come, happen," as in the current term pišâmad "event, happening."

acclaim
  آزوییدن   
âzuyidan

Fr.: acclamer   

1) To welcome or salute with shouts or sounds of joy and approval; applaud.
2) To announce or proclaim with enthusiastic approval (Dictionary.com).

From ac-, variant of → ad-, + → claim.

accomplish
  انجام دادن   
anjâm dâdan (#)

Fr.: accomplir, exécuter   

To bring to its goal or conclusion; carry out; perform; finish (Dictionary.com).

M.E. accomplice, from O.Fr. acompliss-, p.p. stem of acomplir "to fulfill, complete," from L. → ad- "to" + complere "to fill up," → complete.

Anjâm dâdan, literally "to make an end of, to finish; to carry out," from anjâm "end, conclusion" (from Mid.Pers. hanjâm "end, completion, outcome;" ultimately from Proto-Ir. *ham-gam-, from *ham-, → com-, + *gam- "to come," cf. Av. gam- "to come," related to Pers. âmadan, → walk), + dâdan "to give, commit," → yield.

accomplishment
  انجامداد   
anjâmdâd

Fr.: œuvre accomplie, projet réalisé   

1) An act or instance of carrying into effect; fulfillment.
2) Something done admirably or creditably (Dictionary.com).

accomplish; → -ment.

account
  اژمر   
ažmar

Fr.: compte   

On a multiuser → computer system or → network, a method of identifying a particular → user, usually requiring a → password to enter.

M.E. a(c)ount(e), ac(c)ompte, from O.Fr. aco(u)nte, acont, "account, reckoning, terminal payment," from a "to," → ad- + cont "counting, reckoning of money to be paid," from L.L. computus "a calculation," from L. computare "calculate, → compute."

Ažmar, from Kurd. žmârtin, žmêr-, variant of šomâr, šomârdan "to → count."

accrete
  فربالیدن   
farbâlidan

Fr.: accréter   

To grow or increase gradually, by the process of → accretion.

Back-formation from → accretion.

accreted gas
  گاز ِ فربالیده   
gâz-e farbâlidé

Fr.: gaz accrété   

The gas involved in various accretion processes, such as that fed into an → accretion disk, pulled by a compact object, or used in the mass growth of a galaxy.

accretion; → gas.

accreting
  فربالنده   
farbâlandé

Fr.: accréteur   

That → accretes, such as → accreting star and → accreting neutron star.

Adjective from → accrete + → -ing.

accreting neutron star
  ستاره‌ی ِ نوترونی ِ فربالنده   
setâre-ye notroni-ye farbâlandé

Fr.: étoile à neutron accrétrice   

A → neutron star in a → binary system that accretes matter from the → campion star, either from the → stellar wind or from an → accretion disk that forms if the companion overflows its → Roche lobe. The → gravitational energy from the infalling matter provides at least part of the energy for the observed radiation and the accretion torques dominate the spin evolution. Despite these common properties, accreting → neutron stars display a wide variety of behaviors, depending on the neutron star → magnetic field strength, mass of the companion and properties of → accretion (A. K. Harding, 2013, Front. Phys. 8, 679).

accreting; → neutron; → star.

accreting star
  ستاره‌ی ِ فربالنده   
setâre-ye farbâlandé

Fr.: étoile accrétrice, étoile qui accrète   

The star which → accretes matter, particularly in its protostellar phase or in a close binary system.

accreting; → star.

<< < -es -iv -ti 21- a p abe abs abs acc acc acc act act ada adi ads aes Age Alb Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app app arb are ari art ass ast ast ast Atl ato ato Aug aut awa azi bac bal Bar Bar Bay bea Bep Bet BIC bij bin bio bir bla bla blu blu bol Boo bou Bq bre bri bub B[e cal cal can car car Cas cat cau cel cen Cer cha cha cha che chi CI cir cir cla cle clo clu co- cob 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 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 deu dia dif dif dif dim dip Dir dis dis dis dis dis div dom dos dou dri Dum dus dyn dyn ear eas ecl Edd eff Ein eje ele ele ele ele eli emb emi Enc ene ens eph epo equ equ eru eth Eul eve evo exc exc exi exo exp exp ext ext Fab fai Fan fea fem fer fie fil fir fir fla flo flu foc For for fos fra fre fre fro fun g m Gal gal gal gas gau gel gen geo geo geo gho gla gno gra gra gra gra Gre Gre gro gyr had hal har Har HD hea hel hel Her Her Hic hig hip hol hor hos hov Hub hun hyd hyd Hyd hyp IC ide ill ima imp imp inc inc ind ind inf 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 Kle Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Mei Mer 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 oxi pai pan par par par par pas pea pen per per per per Per pet pha Pho pho pho pho Pic Pis Pla pla pla pla Ple poa pol pol pol pol pop pos pos pow 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 rar Ray rea Rea rec rec red red ref ref reg rel rel rel rep res res res res ret Rhe rid rig ris Roe Ros rot rub rut Sag sam sat sca sca Sch sci sea sec sec see sel sem sen ser Sgr sha shi sho sid sig sim sin Sir ske sli smo soc sol sol sol sol sol sou sou spa spe spe spe spe sph spi spl spu sta sta sta sta sta ste ste sti sto str Str sub sub sub sul sup sup sup sup sur sus sym syn sys Tam Tay tel ten Ter Tha the the the thi thr tib tid tim tok Tor tot tra tra tra tra Tri tri tro tru tur twi Typ ufo ult unc uni uni uni upl ura uti val var vec vel ver ver vil vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yea You zer zod > >>