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: 13048 Search : far
un-
  نا-   
nâ- (#)

Fr.: in-, non-   

A prefix meaning "not."

M.E., O.E. un- (cf. O.Fris., O.H.G., Ger. un-, Goth. un-, Du. on-), cognate with Pers. nâ-, as below.

Nâ- "not," variants na "no, not," ma- "not" (prohitive); Mid.Pers. nê, ma "no, not;" O.Pers. naiy, nai "not;" Av. nôit, naē "not;" cf. Skt. "not;" L. ne-, in-, un-; Gk. ni; Lith. ; O.C.S. ne "not;" E. un-, as above; PIE *ne-.

unaided eye
  چشم ِ بی‌یاور، ~ ِ برهنه   
cašm-e biyâvar, ~ berehné

Fr.: œil nu   

The eye unassisted by an optical instrument, except for eyeglasses. Same as → naked eye.

un- + aided, from aid, M.E. ayde, from O.Fr. aidier, from L. adjutare, frequentative of adjuvare "to give help to," from → ad- "to" + juvare "to help;" → eye.

Cašm, → eye; biyâvar "without help," from bi- "without" + yâvar, variant yâr "helper; companion" (Mid.Pers. hayyâr "helper," hayyârêh "help, aid, assistance," Proto-Iranian *adyāva-bara-, cf. Av. aidū- "helpful, useful"); berehné, → naked.

unavoidable
  ناتسنیدنی   
nâtosnidani

Fr.: inévitable   

Impossible to avoid.

avoid; → -ance.

unbiased
  بی‌وَرَک   
bi-varak

Fr.: non biaisé   

Not biased or prejudiced.
Statistics: With an expected value that is equal to the parameter being estimated.

un- + → biased.

Bi- "without" + varak, → bias.

unbiased estimator
  بر‌آور ِ بی‌وَرَک   
barâvar-e bi-varak

Fr.: estimateur non biaisé   

A sample statistics when the mean of the sampling distribution of that statistic can be shown to be equal to the parameter being estimated.

unbiased; → estimator.

unbiased sample
  نمونان ِ بی‌وَرَک   
nemunân-e a bi-varak

Fr.: échantillon non biaisé   

A sample in which every individual element in the population has an equal chance of being selected.

unbiased; → sample.

unblanketed model
  مدل ِ ناپتومند   
model-e nâpatumand

Fr.: modèle non blanketé   

A stellar atmosphere model which ignores metals and their physical effects. → line-blanketed model; → line blanketing.

un-; → blanketed model.

unbound
  نابندیده   
nâbandidé

Fr.: non lié   

1) Not bound or tied up.
2) Not held by a → chemical bond, → gravity, or other physical force (OxfordDictionaries.com).
See: → unbound charge, → unbound cluster, → unbound system.

un-; → bound.

unbound charge
  بار ِ نابندیده   
bâr-e nâbandidé

Fr.: charge non liée   

Same as → free charge.

unbound; → charge.

unbound cluster
  خوشه‌ی ِ نابندیده   
xuše-ye nâbandidé

Fr.: amas non lié   

A cluster of objects, such as stars or galaxies, in which the members are not tied together gravitationally. In such a cluster the members scatter through space following different directions. → bound cluster.

unbound; → cluster.

unbound system
  راژمان ِ نابندیده   
râžân-e nâbandidé

Fr.: système non lié   

An association of bodies which are not gravitationally tied together.

unbound; → system.

unbound young stellar system (UYSS)
  راژمان ِ ستاره‌ای ِ جوان ِ نابندیده   
râžmân-e setâre-yi-ye javân-e nâbandidé

Fr.: système stellaire jeune non lié   

A class of gravitationally loose stellar conglomerate with a notable apparent shape making it different from typical → bound  → star clusters. The UYSS class includes a large range of objects, which extend at various size scales and at various degrees of self-binding; from small (semi-)compact → unbound systems named → stellar associations, to huge extended superstructures of → massive stars that make up whole parts of Galactic → spiral arms, known as → stellar complexes (Gouliermis, D. A., 2018, PASP 130:072001; arXiv:1806.11541).

unbound; → young; → stellar; → system.

unbounded function
  کریای ِ بیکران   
karyâ-ye bikarân

Fr.: fonction non bornée   

The function y = f(x) in a given range of the argument x if there is no number M such that for all values of x in the range under consideration the inequality | f(x) | ≤ M will be fulfilled. → bounded function.

unbound; → function.

uncertainty
  ناتاشتیگی   
nâtâšigi (#)

Fr.: incertitude   

The state of being uncertain; unpredictability; indeterminacy. → uncertainty principle.

un- + → certainty.

uncertainty principle
  پَروَز ِ ناتاشتیگی   
parvaz-e nâtâštigi

Fr.: principe d'incertitude   

A quantum mechanical principle due to Werner Heisenberg which states that the position and momentum of a particle cannot be determined simultaneously with any arbitrary accuracy. These quantities can be determined only with accuracies limited by the relation Δx.Δp ≥ (1/2)ħ, where Δx is the error in the determination of the position and Δp is the error in the momentum. A similar relation holds for the energy of a particle and the time, ΔE.Δt ≥ (1/2)ħ. Same as → Heisenberg uncertainty principle.

uncertainty; → principle.

unclassified B[e] star (unclB[e])
  ستاره‌یِ B[e]ی ِ بی‌رده   
setâre-ye B[e]-ye bi radé

Fr.: étoile B[e] non-classée   

A temporary designation for a → B[e] star that cannot be placed in any of the four known classes.

classification; → B[e] star.

unclear
  نارونه   
nâruné

Fr.: non clair   

Difficult to see, hear, understand, or to be sure about.

un-; → clear.

unconditional
  نابوتاری، نابوتارمند   
nâbutâri, nâbutârmand

Fr.: inconditionnel   

Not limited by conditions; absolute.

un-; → conditional.

unconscious
  ناهاسن   
nâhâsan

Fr.: non conscient   

Not awake and aware; not responding to one's environment.

non-; → conscious.

unconsciousness
  ناهاسنی   
nâhâsani

Fr.: non conscience   

The → state of being → unconscious.

unconscious; → -ness.

<< < -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 > >>