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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13048 Search : far
propagation number
  عدد ِ توچش   
'adad-e tuceš

Fr.: nombre d'onde   

A parameter, denoted k = 2π/λ, that along with the → angular frequency, ω = 2πν, is used to express the equation of → simple harmonic motion, y = cos (ωt - kx + π/2). Same as → wave number.

propagation; → number.

propel
  پیشراندن   
pišrândan (#)

Fr.: propulser   

To drive, or cause to move, forward or onward.

From L. propellere "to push forward," from → pro- "forward" + pellere "to push, drive."

Pišrândan, from piš "before; in front," from Mid.Pers. pêš "before, earlier," O.Pers. paišiya "before; in the presence of" + rândan "to push, drive, cause to go," causative of raftan "to go, walk, proceed" (present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").

propellant
  پیشرانه   
pišrâné (#)

Fr.: propulseur   

A propelling agent. A substance, usually a mixture of fuel and oxidizer, for propelling a rocket.

From → propel + suffix -ant.

Pišrâné, from pišrândan, → propel.

proper
  سره   
saré (#)

Fr.: propre   

Belonging or pertaining exclusively or distinctly to a person, thing, or group. → proper mass; → proper motion; → proper time.

M.E., from O.Fr. propre, from L. proprius "one's own."

Saré "pure; principal."

proper distance
  اپست ِ سره   
apest-e saré

Fr.: distance propre   

A distance between two nearby events in the frame in which they occur at the same time. It is the distance measured by a ruler at the time of observation. Hence, for a cosmological time t, Dproper = DC . a(t), where DC is the → comoving distance, and a(t) is the → scale factor. In the present epoch a = a(tobs) = 1, and Dproper = DC.

proper; → distance.

proper mass
  جرم ِ سره   
jerm-e saré

Fr.: masse propre   

Same as → rest mass.

proper; → mass.

proper motion
  جنبش ِ سره   
jonbeš-e saré

Fr.: mouvement propre   

The apparent motion of a star across the sky (not including a star's parallax), arising from the star's velocity through space with respect to the Sun. Proper motion is usually tabulated in star catalogs as changes in right ascension and declination per year or century. See also: → proper motion distance.

proper; → motion.

proper motion distance
  دورای ِ جنبش ِ سره   
durâ-ye jonbeš-e saré

Fr.: distance mouvement propre   

The distance derived from the → proper motion of an object. If an object has a known → transverse velocity  u, and has an observed angular motion of dθ/dt, then the proper motion distance is defined as: d = u/(dθ/dt).

proper; → motion; → distance

proper subset
  زیرهنگرد ِ سره   
zirhangard-e saré

Fr.: sous-ensemble propre   

Of two sets A and B, the set A if it is contained in B (A ⊂ B) but is not equal to B (A ≠ B).

proper; → subset.

proper time
  زمان ِ سره   
zamân-e saré (#)

Fr.: temps propre   

In general relativity, the time as measured on a clock that travels with the observer in the same system. An accelerated clock will measure shorter time intervals between events than a non-accelerated clock between the same events. → twin paradox.

proper; → time.

property
  داراک   
dârâk

Fr.: propriété   

1) General: An essential or distinctive attribute or quality of a thing.
2) Physics: A quantity, such as length, mass, pressure, temperature, or volume, that relates to the state of a system and can be expressed in numbers obtained from well-defined measurement operations.

From M.E. propriete "ownership, something owned, one's own nature," from M.Fr. propriété, from L. proprietas "ownership, property, propriety," literally "special character," noun of quality from proprius "one's own, special."

Dârâk "thing owned," from dâr present stem of dâštan "to have, to possess" + -âk (on the model of xorâk, pušâk, kâvâk). The first element dâštan, from Mid.Pers. dâštan, O.Pers./Av. root dar- "to hold, keep back, maintain, keep in mind;" Skt. dhr- "to to hold, keep, preserve," dharma- "law;" Gk. thronos "elevated seat, throne;" L. firmus "firm, stable;" Lith. daryti "to make;" PIE *dher- "to hold, support."

proplyd
  پروپلید   
proplid

Fr.: proplyde   

A circumstellar disk of dense gas and dust surrounding a young newly formed star, a T Tauri star or Herbig star. In particular, an externally ionized protoplanetary disk seen in emission in the Orion Nebula. → silhouette disk.

Contraction of protoplanetarydisk.

proportion
  برپارش   
barpâreš (#)

Fr.: proportion   

Comparative relation between things, sizes, quantities, numbers, parts, etc.
Math.: A statement of the equality of two ratios.

M.E. proporcio(u)n, from O.Fr. proportion, from L. proportio "comparative relation, analogy," from the phrase pro portione "according to the relation" (of parts to each other), from pro "for" + portio "part, shar."

Barpâreš, from bar- "on; up; upon; in; into; at; forth; with; near; before; according to" (Mid.Pers. abar; O.Pers. upariy "above; over, upon, according to;" Av. upairi "above, over," upairi.zəma- "located above the earth;" cf. Gk. hyper- "over, above;" L. super-; O.H.G. ubir "over;" PIE base *uper "over") + pâr "part, portion, piece" (variants pâréparré "portion, segment (of an orange)," pargâlé, "piece, portion; patch;" (dialects Kermâni pariké "portion, half;" Tabari perik "minute quantity, particle;" Lârestâni pakva "patch;" Borujerdi parru "patch"); Mid.Pers. pârag "piece, part, portion; gift, offering, bribe;" Av. pāra- "debt," from par- "to remunerate, equalize; to condemn;" PIE *per- "to sell, hand over, distribute; to assigne;" Gk. peprotai "it has been granted;" L. pars, as above; Skt. purti- "reward;" Hitt. pars-, parsiya- "to break, crumble") + -eš suffix.

proportional
  برپارشی   
barpâreši

Fr.: proportionnel   

Being in or characterized by proportion.
Math.: Of two quantities, having the same or a constant ratio or relation.

proportion + → -al.

proportional counter
  شمارگر ِ برپارشی   
šomârgar-e barpâreši

Fr.: compteur proportionnel   

A device in which an electronic detection system receives pulses that are proportional to the number of ions formed in a gas-filled tube by ionizing radiation.

proportional; → counter.

proportionality
  برپارشیگی   
barpârešigi

Fr.: proportionalité   

Math.: A relationship bewteen two quantities such that if one quantity changes the other changes in the same proportion; denoted as y ∝ x.

proportional + → -ity.

proportionality constant
  پایای ِ برپارشیگی   
pâyâ-ye barpârešigi

Fr.: constante de proportionalité   

Math.: A → constant that converts a proportionality into an → equation. Thus the proportionality constant k converts the proportionality y ∝ x into the equation y = kx.

proportionality + → constant.

propose
  فراهلیدن   
farâhelidan

Fr.: proposer   

To offer or suggest (a matter, subject, case, etc.) for consideration, acceptance, or action (Dictionary.com).

M.E., from M.Fr. poposer, from → pro- "forth," + poser "put, place," → position.

Farâhelidan, from farâ-, → pro-, + helidan, heštan "to place, put" from Mid.Pers. hištan, hilidan "to let, set, leave, abandon," Parthian Mid.Pers. hyrz; O.Pers. hard- "to send forth," ava.hard- "to abandon;" Av. harəz- "to discharge, send out; to filter;" hərəzaiti "releases, shoots;" cf. Skt. srj- "to let go or fly, throw, cast, emit, put forth;" Pali sajati "to let loose, send forth."

proposition
  فراهل، گزاره   
farâhel, gozâré (#)

Fr.: proposition   

1) The act of offering or suggesting something to be considered, accepted, adopted, or done.
2) A plan or scheme proposed.
3) Logic: A statement in which something is affirmed or denied, so that it can therefore be significantly characterized as either true or false.
4) Math.: A formal statement of either a truth to be demonstrated or an operation to be performed; a theorem or a problem (Dictionary.com).

Verbal noun of → propose.

propositional
  گزاره‌ای   
gozaare#ay (#)

Fr.: propositionnel   

Logic: Of, relating to, or in the form of a → proposition.

proposition; → -al.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit 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 con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima Ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo 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 Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad ran rar ray rea rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr 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 tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>