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: 12948 Search : far
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.

unda
  شن-تل   
šen-tal

Fr.:   

A dune on a planetary surface, used in plural form undae.

From L. unda "wave," cognate with → water.

Šen-tal, from šen "sand" + tal "hill, heap."

under-
  کم-   

Fr.: sous-, faible   

A prefixal use of under, as to indicate place or situation below or beneath. Contrary to → over-.

M.E., from O.E. (cf. O.H.G. untar, Ger. unter, Goth. undar), from PIE *ndhero- "lower;" cf. Av. aδara- (adj.), aδairi- (prep.) "below;" Mid.Pers. êr "below, down; low, under," adar "low," azêr "below, under" (Mod.Pers. zir "below, down"); Skt. ádhara- "lower;" O.E. under "under, among").

Kam- "little, few; deficient, wanting; scarce" (Mid.Pers. kam "little, small, few," O.Pers./Av. kamna- "small, few").

underabundance
  کم‌فراوانی   
kamfarâvâni

Fr.: sous-abondance   

The abundance of a chemical element being lower than a reference value, in particular compared to that of the Sun.

under-; → abundance.

underdamping
  کم‌میرایی   
kam-mirâyi

Fr.: amortissement faible   

The behavior of a damped system when the amount of damping is weak so that the system oscillates with the amplitude gradually decreasing to zero. → overdamping.

under-; → damping.

underestimate
  ۱) کم-بر‌آوردن؛ ۲) کم-بر‌آورد   
1) kam-baravardan; 2) kam-baravard

Fr.: 1) sous-estimer; 2) sous-estimation   

1) To estimate at too low a value, rate, or the like.
2) An estimate that is too low. → overestimate.

under-; → estimate

underqualified
  کمچوناییده، کمچونامند   
kamcunâyide, kamcunâmand

Fr.: sousqualifié   

Insufficiently qualified for a particular job (OxfordDictionaries.com).

under-; → qualified.

undersampling
  کم‌نمونان‌گیری   
kam-nemunângiri

Fr.: sous-échantillonage   

The circumstance in which there are not enough pixels in a star's image. The number of pixels that make up a star's image is determined by the relationship between the telescope focal length, the physical size of the pixels, and the size of the star's image. With an undersampled image it is not possible to obtain accurate estimates of the star's image size or its position. Undersampling occurs when the atmospheric seeing conditions are exceptionally good and the pixel size not small enough.

under-; → sampling.

understand
  فهمیدن   
fahmidan (#)

Fr.: comprendre   

To perceive the meaning of.

M.E. understanden, understonden, O.E. understandan "comprehend, grasp the idea of," probably literally "to stand in the midst of," from → under- + standan "to stand," cognate with Pers. istâdan, → standard.

Fahmidan, from Ar. fahm + infinitive suffix -idan.

understanding
  فهم   
fahm (#)

Fr.: compréhension, entendement, intelligence   

The ability to understand something; the → power of → abstract  → thought.

understand; → -ing.

undetermined
  ناترمیده   
nâtarmidé

Fr.: indéterminé   

1) Not definitely or authoritatively decided or settled.
2) Not known.

un-; → determined.

undifferentiated meteorite
  شهاب‌سنگ ِ نا-دگرسانیده   
šahâbsang-e nâdegarsânidé

Fr.: météorite indifférenciée   

A type of meteorite in which the constituting materials (stone, glass, metal) are mixed together in a disorderly mass, in contrast to → differentiated meteorites.

un-; → differentiated meteorite.

undulation
  موجش   
mowješ

Fr.: ondulation   

A wave; the motion of waves.
A wavelike motion in any medium.

From L.L. undulatus "wavy, undulated," from undula "wavelet," diminutive of L. unda "wave."

Mowješ, verbal noun of mowjidan "to undulate," from mowjwave.

uni-
  یک-   
yek- (#)

Fr.: uni-   

A prefix with the meaning of "one" occurring in loanwords from L., such as → uniform, → uniaxial, → universe, etc.

From uni- a combining form meaning "one," from L. uni-, from unus, → one;

Yek-, from yek, → one.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>