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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<< < -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 > >>

Number of Results: 13048 Search : far
bald patch
  پچ ِ تاس، تکه‌ی ِ ~   
pac-e tâs, tekke-ye ~

Fr.: zone chauve   

The location on the surface of the → Sun where → coronal  → magnetic field lines become tangent to the → photosphere. Bald patches play an important role in solar → magnetohydrodynamics.

bald, such called because of visual reference to a haircut (Titov et al. 1993, A&A 276, 564); → patch.

Baldwin-Phillips-Terlevich diagram
  نمودار ِ بالدوین-فیلیپس-ترلویچ   
nemudâr-e Baldwin-Phillips-Terlevich

Fr.: diagram de Baldwin-Phillips-Terlevich   

A set of nebular → emission line diagrams used to distinguish the ionization mechanism of → nebular gas. The most famous version consists of [N II]λ6584/Hα versus [OIII] λ5007/Hβ. The next two more commonly used BPT diagnostics are [S II] λλ6717,6731/Hα versus [O III] λ5007/Hβ and [O I] λ6300/Hα versus [O III]λ5007/Hβ. These diagrams use strong, optical lines of close proximity in the ratios to limit → reddening and → spectrophotometric effects. They are able to clearly distinguish different classes of → ionization, for example → LINERs from normal → H II regions and → active galactic nuclei.

Baldwin, J. A., Phillips, M. M., Terlevich, R., 1981 PASP 93, 5; → diagram.

ball
  توپ، گوی   
tup (#), guy (#)

Fr.: boule, balle, ballon   

A spherical or approximately spherical body, either solid or hollow.

From M.E. bal, balle, from O.Fr.; cf. O.H.G. ballo, Ger. Ball; PIE root *bhel- "to blow, swell."

Tup "ball," initially "clmup, aggregation, parcel, group" (tup tup "many"); Tabari tupa "compressed, assembled," tuppi "round;" Kurd. top "ball," topâl "round;" guy, → globe.

ball lightning
  گوی ِ آذرخش   
gu-ye âzaraxš (#)

Fr.: foudre en bulle   

A rare form of lightning occurring as a bright red globe observed floating or moving through the atmosphere close to the ground. It usually is seen shortly before or after, or during, a → thunderstorm. Its duration varies from a few seconds to a few minutes. See also → Saint Elmo's fire.

ball; → lightning.

ballistic
  پرتابیک   
partâbik (#)

Fr.: balistique   

Of or relating to → ballistics.

ballistic missile
  موشک ِ پرتابیک   
mušak-e partâbik (#)

Fr.: missile balistique   

A missile that after being launched and guided in the early part of its flight, travels unpowered in a ballistic trajectory.

ballistic; → missile.

ballistic panspermia
  پان‌دانه‌وری ِ پرتابیک   
pân-dâne-vari-ye partâbik

Fr.: panspermie balistique   

Transfer of microbes and biochemical compounds from a planet to another due to meteoric impacts. Debris being knocked off a planet like Mars can reach escape velocity and enter the atmosphere of another planet with passenger micro-organisms intact.

ballistic; → panspermia.

ballistic trajectory
  ترایش ِ پرتابیک   
tarâyeš-e partâbik

Fr.: trajectoire balistique   

A curved path followed by an unpowered object that is being acted upon only by gravitational forces and the friction of the medium through which it moves.

ballistic; → trajectory.

ballistic wave
  موج ِ پرتابیک   
mowj-e partâbik

Fr.: onde balistique   

Audible disturbance or wave caused by the compression of air ahead of a projectile in flight.

ballistic; → wave.

ballistics
  پرتابیک، پرتابشناسی   
partâbik (#), partâbšenâsi (#)

Fr.: balistique   

The science of the motion and behavior of → projectiles. The study of the functioning of firearms.

From L. ballista "ancient military machine for hurling stones," from Gk. ballistes, from ballein "to throw," from PIE *gwelH1- "to throw;" cf. Pers. garzin "arrow;" Av. niγr- "to throw down;" Khotanese (+ *abi-, *ui-) bīr- "to throw, sow;" Proto-Iranian *garH- "to throw."

Partâbik, from partâb "a throw, an arrow that flies far," partâbidan "to throw," + -ik, → -ics; partâbšenâsi, from partâb + -šenâsi, → -logy.

balloon astronomy
  اخترشناسی با بالون، بالون-اخترشناسی   
axtaršenâsi bâ bâlon, bâlon-axtaršenâsi

Fr.: astronomie en ballon   

A branch of modern astronomy in which balloons are used to carry telescopes and instruments to high altitudes (up to 50 km) for observation.

Balloon, from Fr. ballon, from It. dialectal ballone, augmentative of balla, ball, from P.Gmc. *ball-, from PIE *bhel- "to blow, swell". → astronomy.

Axtaršenâsi, → astronomy; bâlon, from Fr. ballon.

balloon-borne telescope
  دوربین ِ بالون-برد، تلسکوپ ~   
durbin-e bâlon-bord, teleskop-e ~

Fr.: télescope porté par ballon   

A remotely guided or automatic telescope carried to high altitudes by a balloon.

balloon astronomy; borne "a past participle of bear," from O.E. beran "bear, bring, wear," from P.Gmc. *beranan (O.H.G. beran, Goth. bairan "to carry"), from PIE root *bher-; "to carry;" compare with Av./O.Pers. bar- "to bear, carry," bareθre "to bear (infinitive)," bareθri "a female that bears (children), a mother," Mod.Pers. bordan "to carry," Skt. bharati "he carries," Gk. pherein, L. fero "to carry." → telescope.

balloon astronomy. Bord in bâlon-bord "borne, carried," from Mod.Pers. bordan "to bear, carry," as explained above. Durbin, → telescope.

Balmer
  بالمر   
Bâlmer

Fr.: Balmer   

From Johann Jakob Balmer (1825-1898), Swiss mathematician and physicist, who explained the visible spectral lines of the hydrogen spectrum in 1885.

Balmer continuum
  پیوستار ِ بالمر   
peyvastâr-e Bâlmer

Fr.: continuum de Balmer   

A continuous range of wavelengths in the Balmer spectrum of hydrogen corresponding to transitions between the energy levels n = 2 and n = .

Balmer; → continuum.

Balmer decrement
  کاهه‌ی ِ بالمر   
kâhe-ye Bâlmer

Fr.: décrément de Balmer   

The intensity ratio among the couple of relatively adjacent → Balmer lines, for example Hα/Hβ and Hβ/Hγ, which have well-known theoretical values. They are used to determine the → interstellar extinction.

Balmer; → decrement.

Balmer discontinuity
  ناپیوستگی ِ بالمر   
nâpeyvastegi-ye Bâlmer

Fr.: discontinuité de Balmer   

An abrupt decrease in the intensity of the continuum at the limit of the → Balmer series of hydrogen (at about 3650 Å), caused by the energy absorbed when electrons originally in the second → energy level are ionized. Same as → Balmer jump.

Balmer; → discontinuity.

Balmer formula
  دیسول ِ بالمر   
disul-e Bâlmer

Fr.: formule de Balmer   

A special solution of the mathematical formula which represents the wavelengths of the various spectral series of hydrogen in which the lower energy level is n = 2.

Balmer; → formula.

Balmer jump
  جهش ِ بالمر   
jaheš-e Bâlmer

Fr.: saut de Balmer   

Same as → Balmer discontinuity.

Balmer; → jump.

Balmer limit
  حد ِ بالمر   
hadd-e Bâlmer

Fr.: limite de Balmer   

The wavelength in the blue end of the → Balmer series, at 3646 Å, near which the separation between successive lines decreases and approaches a → continuum.

Balmer; → limit.

Balmer line
  خط ِ بالمر   
xatt-e Bâlmer

Fr.: raies de Balmer   

The → spectral lines making up the → Balmer series.

Balmer; → line.

<< < -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 > >>