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
overdamping
  بیش‌میرایی   
bišmirâyi

Fr.: sur-amortissement   

The condition of a system in which the damping is so large that the system comes to a position of rest without oscillating.

over-; → damping.

overdense matter
  ماده‌یِ بیش‌چگال   
mâdde-ye biš-cagâl

Fr.: matière surdense   

Matter whose density exceeds a reference level.

over-; → dense; → matter.

overestimate
  ۱) بیش‌بر‌آوردن؛ ۲) بیش‌بر‌آورد   
biš-barâvardan; 2) biš-barâvard

Fr.: 1) surestimer; 2) surestimation   

1) To estimate at too high a value, amount, rate, or the like.
2) An estimate that is too high.

over-; → estimate.

overflow
  سرریز   
sarriz (#)

Fr.: débordement   

In computers, the condition arising when the result of an arithmetic operation exceeds the capacity of the number representation.

over-; → flow.

Sarriz, from sar, → head, + riz present stem of rixtan "to flow, to pour" (Mid.Pers. rēxtan and rēcitan "to flow;" Av. raēk- "to leave, set free; to yield, transfer," infinitive *ricyā; Mod.Pers; rig in morderig "heritage" (literally, "left by the dead"); cf. Skt. rinakti "he leaves," riti- "stream; motion, course;" L. rivus "stream, brook;" Old Church Slavic rēka "river;" Rus. reka "river;" Goth. rinnan "run, flow," rinno "brook;" O.E. ridh "stream").

overhead time
  زمانِ بالاسر   
zamân-e bâlâsar

Fr.:   

The part of observing time at a telescope which is not directly used for science, such as the time spent for detector read-out, changing instruments, focusing, etc.

over-; → head; → time.

Bâlâ "up, above, high, elevated, height" (variants boland "high, tall, elevated, sublime," borz "height, magnitude" (it occurs also in the name of the mountain chain Alborz), Laki dialect berg "hill, mountain;" Mid.Pers. buland "high;" O.Pers. baršan- "height;" Av. barəz- "high, mount," barezan- "height;" cf. Skt. bhrant- "high;" L. fortis "strong" (Fr. and E. force); O.E. burg, burh "castle, fortified place," from P.Gmc. *burgs "fortress;" Ger. Burg "castle," Goth. baurgs "city," E. burg, borough, Fr. bourgeois, bourgeoisie, faubourg; PIE base *bhergh- "high") + sar, → head.

overlap
  ۱) برهم‌نهادن؛ ۲) برهم نشستن؛ ۳) برهم‌نهاد؛ برهم‌نشست   
1) barham nehâdan; 2) barham nešastan; 3) barham nehâd; barham nešast

Fr.: empiéter, chevaucher   

1) (v.tr.) To lap over something else; extend over and cover a part of.
2) (v.intr.) To lap over.
3a) Math.: Of sets, to have one or more elements in common.
3b) Chemistry: The interaction of orbitals on different atoms in the same region of space.
3c) Meteo.: The area common to two successive satellite images or scan swaths along the same or adjacent flight or orbital strips. The amount of overlap is expressed as a percentage of image area or scanned area.

over- + lap, verb from noun lap, from O.E. læppa "skirt or flap of a garment," from P.Gmc. *lapp- (cf. M.Du. lappe, O.H.G. lappa, Ger. Lappen "rag, shred").

1) Barham nehâdan, from barham "one over the other" (for etymology of bar-, → on-; for etymology of ham-, → com-) + nehâdan "to place, put; to set" (Mid.Pers. nihâtan; Av. ni- "down; below; into," → ni-, + dā- "to put; to establish; to give," dadāiti "he gives;" cf. Skt. dadāti "he gives;" Gk. didomi "I give;" L. do "I give;" PIE base *do- "to give").
2) Barham nešastan, from barham, as above, + nešastan "to sit;" Mid.Pers. nišastan "to sit;" O.Pers. nišādayam [1 sg.impf.caus.act.] "to sit down, to establish," hadiš- "abode;" Av. nišasiiā [1 sg.subj.acr.] "I shall sit down," from nihad- "to sit down," from ni-, as above, + had- "to sit;" PIE base *sed- "to sit;" cf. Skt. sad- "to sit," sidati "sits;" Gk. hezomai "to sit," hedra "seat, chair;" L. sedere "to sit;" O.Ir. suide "seat, sitting;" Welsh sedd "seat;" Lith. sedmi "to sit;" Rus. sad "garden;" Goth. sitan, Ger. sitzen; E. sit.
3) → overlapping.

overlapping
  برهم‌نهاد؛ برهم‌نشست   
barham nahâd; barham nešast

Fr.: empiètement, chevauchement   

An act or instance related to → overlap.

Verbal noun of → overlap.

overload
  بیش‌بار   
biš-bâr

Fr.: surcharge   

Electricity: Any load which exceeds the rated output of a machine, transformer, or other apparatus.

over-; → load.

overqualified
  پرچوناییده، پرچونامند   
porcunâyide, porcunâmand

Fr.: surqualifié   

Too highly qualified for a particular job (OxfordDictionaries.com).

over-; → qualified.

oversampling
  بیش‌نمونان‌گیری   
biš-nemunângiri

Fr.: suréchantillonnage   

The process of sampling a signal with a frequency higher than the → Nyquist frequency. The signal is said to be oversampled β times, where the oversampling ratio is defined as β = (sampling frequency)/(Nyquist frequency).

over-; → sampling.

overshooting
  فرازد   
farâzad

Fr.: dépassement   

A situation in stellar interiors when the momentum of a particle carries it past its equilibrium point.

over-; shooting, from shoot, from O.E. sceotan "to shoot" (cf. O.N. skjota, Du. schieten, Ger. schießen), from PIE base *skeud- "to shoot, to chase, to throw, to project."

Farâzad, from farâ- "over, over against; foremost; before; onward" (Mid.Pers. fra-; O.Pers. fra- "forward, forth;" Av. frā "forth," pouruua- "first"; cf. Skt. pūrva- "first," pra- "before, formerly;" Gk. pro; L. pro; O.E. fyrst "foremost," superlative of fore, E. fore) + zad past stem of zadan "to strike, beat, dash against; to shoot" ( Mid.Pers. zatan, žatan; O.Pers.; Av. jan-, gan- "to strike, hit, smite, kill" (jantar- "smiter"); cf. Skt. han- "to strike, beat" (hantar- "smiter, killer"); Gk. theinein "to strike," phonos "murder;" L. fendere "to strike, push;" Gmc. *gundjo "war, battle;" PIE *gwhen- "to strike, kill").

overtake
  فرازرسیدن   
farâzrasidan

Fr.: rattraper   

To catch up with in traveling or pursuit; draw even with (Dictionary.com).

over-; → take.

Farâzrasidan, from farâz "upon, above, over," → height, + rasidan "to attain, to arrive," → access.

overtone
  اَبَرتن   
abarton (#)

Fr.: harmonique   

A note of lesser intensity and higher frequency than the fundamental note, and superimposed upon the latter to give a note of characteristic quality. Overtones whose frequencies are an integral multiple of the fundamental are said to form a harmonic series. The fundamental with a frequency f1 is the first harmonic. The frequency 2f1 is the first overtone and so on.

over-; → tone.

overvoltage
  بیش‌ولتاژ   
biš-voltâž

Fr.: surtension   

Voltage which exceeds the normal value between a conductor and earth.

over-; → voltage.

owl
  جغد، بوف   
joqd (#), buf (#)

Fr.: hibou, chouette   

Any of an order (Strigiformes) of chiefly nocturnal birds of prey with a large head and eyes, short hooked bill, strong talons, and soft fluffy often brown-mottled plumage (Merriam-Webster.com).

Owl, from O.E. ule, from P.Gmc. *uwwalon (cf. Du. uil, O.H.G. uwila, Ger. Eule), a diminutive of root *uwwa, which is imitative of an owl's hoot (cf. L. ulula "owl;" Gk. ololyzein "to cry aloud," Skt. uluka- "owl."

Buf "owl;" Mid.Pers. bûf "owl," related to Av. bucahin- "he who is prone to howling," buxti- "howling, hissing" (Pokorny); cf. Skt. bukk- "to bark, yelp;" Gk. buas "owl;" L. bubo "owl" (Fr. hibou); Arm. bou "owl."
Joqd "owl," probably related to jiq "shreak, clamour, cry."

Owl Nebula
  میغِ بوف، ~ِ جغد   
miq-e buf, ~ joqd

Fr.: Nébuleuse de la Chouette   

A → planetary nebula in the constellation → Ursa Major, one of the four planetary nebulae in → Messier catalog. It is one of the more complex planetary nebulae known. Its appearance has been interpreted as that of a cylindrical torus shell viewed obliquely, so that the projected matter-poor ends of the cylinder correspond with the Owl's eyes. Also known as M97 or NGC 3587.

Discovered by Pierre Méchain in 1781, the name goes back to Lord Rosse, who first used it in 1848. → owl; → nebula.

oxidant
  ا ُکسنده   
oksandé (#)

Fr.: oxydant   

The substance which supplies the → oxygen in an → oxidation → reaction. Same as → oxydizing agent agent and → oxidizer.

Agent noun from → oxidize.

oxidation
  ا ُکسایش   
oksâyeš (#)

Fr.: oxydation   

The combination of → oxygen with a substance, or the removal of → hydrogen from it.

Verbal noun of → oxidize.

oxidation number
  شمار ِ اکسایش   
šomâr-e oksâyeš

Fr.: nombre d'oxydation   

The total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom. In other words, the charge that atom would have if the compound was composed of ions. The oxidation number of an atom is zero in a neutral substance that contains atoms of only one element. Same as → oxidation state.

oxidation; → number.

oxidation state
  استات ِ اکسایش   
estât-e oksâyeš

Fr.: état d'oxydation   

Same as → oxidation number.

oxidation; → state.

<< < -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 > >>