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: 13176 Search : in
backscattered light
  نور ِ پس-پراکنده   
nur-e pas-parâkandé

Fr.: lumière rétrodiffusée   

The light that has undergone → backscattering.

backscatter; → backscattering.

backscattering
  پس-پراکنش   
pas-parâkaneš

Fr.: rétrodiffusion   

Scattering of radiation or particles through angles greater than 90° with respect to the original direction of motion.

scattering.

backup
  پشتوان   
poštvân (#)

Fr.: sauvegarde   

A copy of computer files that is stored separately from the original in order to protect against loss of data.

Backup "substitute, support," from → back + up.

Poštvân "prop, support, help" from pošt, → back, + -vân suffix denting protection, variant of -bân.

backup program
  برنامه‌ی ِ یدکی   
barnâme-ye yadaki (#)

Fr.: programme de remplacement   

An auxiliary observing program to be carried out at telescope in case the atmospheric conditions make the main program unfeasible.

Backup, from → back + up; → program.

Barnâmé, → program; yadaki "reserve, substitute," from yadak "a led horse."

backward
  پس-سو   
pas-su

Fr.: en arrière   

1) Toward the back or rear.
2) Directed toward the back or past.

back; → -ward.

backwarming effect
  ا ُسکر ِ فروگرمی   
oskar-e forugarmi

Fr.: effet de rétro-réchauffement   

A sort of → greenhouse effect in → stellar atmospheres where the deeper layers heat up due to overlying → opacity. The presence of numerous → bound-bound opacities of → metals amplifies the → scattering of → photons, in particular their → backscattering, forcing the → temperature to increase in order to conserve the radiation flux and the transport of energy from the interior to the outer parts of the atmosphere.

back; → warming; → effect.

bad column
  ستون ِ بد   
sotun-e bad

Fr.: mauvaise colonne   

Column of a → CCD detector that does not correctly read out charge.

Bad, from M.E. badde, but the origin of the word is not clear; → column.

Sotun, → column; bad, from Mid.Pers. wad, maybe from Old Iranian *vata- "small;" cf. Scythian bata- "small, bad," Sogdian wtγy "suffer, sorrow."

Baily's beads
  مهره‌های ِ بیلی   
mohrehâ-ye Beyli (#)

Fr.: perles de Baily   

A phenomenon that occurs during a total eclipse of the Sun. Just prior to and after totality, sunlight shines through the lunar valleys on the Moon's limb, causing the dark face of the Moon to appear to be surrounded by a shining "necklace of pearls".

Baily, from Francis Baily (1774-1844), English amateur astronomer, who discovered the phenomenon during the solar eclipse of 1836. Beads "a necklace of beads or pearls; a rosary," from bead "a small, often round piece of material, such as glass, plastic, or wood, that is pierced for stringing or threading," from M.E. bede "rosary bead," from O.E. bed, bedu, gebed "prayer;" PIE *gwhedh- "to ask, pray".

Mohrehâ "beads," from mohré "a kind of small shell resembling pearls; glass or coral beads," cf. Khotanese mrâhe, may be related to morvârid, → pearl, + -hâ suffix of plurals.

bait
  چشته   
cašté (#)

Fr.: appât   

Something edible placed on a hook or in a trap to attract fish or other animals as prey.

M.E., from O.Norse beita "food," O.E. bat "food," literally "to cause to bite."

Cašté "bait," related to câšni "taste," cašidan, caš- "to taste," câšt "breakfast;" Mid.Pers. câšt "meal," câšnig "taste;" cf. Skt. cas- "to eat;" Proto-Ir. caš- "to eat, to drink; to drip."

balance
  ۱) ترازو؛ ۲) تراز، ترازمندی   
1) tarâzu; 2) tarâz, tarâzmandi

Fr.: balance   

1a) A weighing device.
1b) The constellation → Libra.
2) A state of equilibrium.

M.E balaunce, from O.Fr. balance "balance, scales for weighing," from M.L. bilancia, from L.L. bilanx, from L. (libra) bilanx "(scale) having two pans," possibly from L. bis "twice" + lanx "dish, plate, scale of a balance."

Tarâzu, → Libra.

bald
  کل، گر، کچل، تاس   
kal, gar, kacal, tâs

Fr.: chauve   

Having little or no hair on the scalp. → bald patch.

Bald from M.E. ball(e)d; Celtic bal "white patch, blaze;" Gk. phalios "having a white spot;" L. fulica "coot;" → patch.

Kal "bald," Mid.Pers. gar "bald;" Av. kaurva- "bald;" cf. Skt. kulva- "bald, thin-haired;" L. calvus "naked, bald."
Kacal may be related to kal.
Tâs, variant taz "bald;" Tabari tisâ, Saraxsi, Lâsgardi, Sangesari tusâ "empty;" related to tohi "empty;" Mid.Pers. tuhig; Av. taoš- "to become empty," pres. tusa-, caus. taošaya-, tusən "they lose their posture;" cf. Skt. tuccha-, tucchya- "empty;" L. tesqua, tesca "deserted place;" Russ. tošcij "hollow;" PIE base *teus- "to empty."

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.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB 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 coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl 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 inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc 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 ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl 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 > >>