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: 13116 Search : far
proof
  آوین   
âvin

Fr.: preuve   

1) A particular piece of evidence that is sufficient to show or helps to establish a fact.
2) The establishment of the truth of anything; demonstration.
3) Math. Logic: A sequence of statements that establishes the truth of a proposition.

M.E. prove, prooff, prof, proufe, O.Fr. prueve, from L.L. proba "a proof," a back-formation from L. probare "to prove," from probus "worthy, good, upright," from PIE *pro-bhwo- "being in front," from → pro- + *bhu- "to be;" cf. Pers. budan "to be," → condition.

Âvin, on the model of Ger. Beweis "proof," from weisen "to show, point out;" O.E. witan "to see." âvin "to show, see," from intensive prefix â- + vin "to see" (as in a large number of dialects), variant bin, present stem of didan "to see;" Mid.Pers. wyn-; O.Pers. vain- "to see;" Av. vaēn- "to see;" cf. Skt. veda "I know;" Gk. oida "I know," idein "to see;" L. videre "to see;" Ger. weisen "to show," as above; PIE base *weid- "to know, to see."

propaganda
  فراتوچان   
farâtucân

Fr.: propagande   

Information, ideas, or rumors deliberately spread widely to help or harm a person, group, movement, institution, nation, etc. (Dictionary.com).

From N.L. propaganda, short for Congregatio de Propaganda Fide, "congregation for propagating the faith," a committee of cardinals established in 1622 by Gregory XV to supervise foreign missions, from L. propagare, → propagate.

Farâtucân, from prefix farâ-, → pro-, + tucân from tucidan, → propagate.

propagate
  ۱) توچیدن؛ ۲) توچاندن   
1) tucidan; 2) tucândan

Fr.: 1) se propager; 2) propager   

1) v.intr.: (of → electromagnetic waves, → compression waves, etc.) To travel through space or a physical → medium.
2) v.tr.: To create (an effect) at a distance, as by electromagnetic waves, compression waves, etc., traveling through space or a physical medium.

From L. propagatus, p.p. of propagare "multiply plants by layers, spread for sprouting, propagate, enlarge," from propag(es) "something set out, scion, slip," from → pro- "forth" + pag base of pangere "to fasten" + es noun suffix + -atus "-ate."

Tucidan, from several dialects: Malayeri "to scatter, disperse; to diffuse;" Lori tic "scattered, dispersed," ticene "to scatter, disperse; to diffuse;" Laki tvic "dispersed, scattered;" Aligudarzi tij "scattered, dispersed;" Borujerdi tuc "scatter," tucessan "to scatter, diffuse," tucesa "dispersed, scattered, diffused;" probably related to Proto-Ir. θrāš- "to scatter, spread, strew" cf. Yaghnobi côš- "to spread, scatter, sow," tiráš-, têráš-, tirayš-/tirášta "to fall (down, off); to become ill; to drop;" (+*ui- ?) Ossetic .I. irtasyn/irtæst, D. ærtasun/ærtast "to separate, distinguish; to take away; to choose;" Sogd. š'š "to scatter, disperse;" šyš- "to be scattered" (Cheung, 2007)

propagation
  توچش   
tuceš

Fr.: propagation   

Physics: The act or process of propagating, especially the process by which a disturbance, such as the motion of electromagnetic or sound waves, is transmitted through a medium such as air or water. Linguistically related notions: → diffusion (پخش); → dispersion(پاشش); → scattering (پراکنش); → diffraction (پراش).

Verbal noun of → propagate.

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.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 cou Cra Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>