An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 179
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.

uniaxial crystal
  بلور ِ یک‌آسه   
bolur-e yek-âsé

Fr.: cristal uniaxe   

Crystal with double refraction possessing only one → optic axis.

uni-; axial adj. from → axis; → crystal.

unidentified
  نا-ایدانیده   
nâ-idânidé

Fr.: non identifié   

The attribute of someone or something whose identity is not established. → unidentified flying object; → unidentified line.

un-; → identify.

unidentified flying object (UFO)
  بر‌آخت ِ پرنده‌ی ِ نا-ایدانیده، پدیده‌ی ِ هوا-فضایی ِ نا-ایدانیده   
barâxt-e parande-ye nâ-idânidé, padide-ye havâ-fazâyi-ye nâ-idânidé

Fr.: Objet Volant Non Identifié (OVNI)   

Any flying object or phenomenon that cannot be identified by the observer.

unidentified; fly; M.E. flien; O.E. fleogan (cf. O.H.G. fliogan, O.N. flügja, M.Du. vlieghen, Ger. fliegen); → object.

Unidentified Infrared Band (UIB)
  باند ِ فروسرخ ِ نا-ایدانیده   
bând-e forusorx-e nâ-idânidé

Fr.: bande infrarouge non identifiée   

A no longer in general use name for → Aromatic Infrared Band.

unidentified; → infrared; → band.

unidentified line
  خط ِ نا-ایدانیده   
xatt-e nâ-idânidé

Fr.: raie non identifiée   

A spectral line whose origin is not clearly established. → line identification.

unidentified; → line.

unification
  یگانش   
yegâneš

Fr.: unification   

1) The process of unifying or uniting; union.
2) The state or condition of being unified (Dictionary.com).

Verbal noun of → unify.

uniform
  یکدیس، یکنواخت   
yekdis, yeknavâxt

Fr.: uniforme   

Without variations; identical, always the same in quality, degree, character, or manner.

uni- + → form.

Yekdis, from yek, → uni-, + dis, → form; yeknavâxt, literally "with one rhythm," from yek, → one, + navâxt "rhythm," from navâxtan, navâzidan "to play an instrument; to gratify," navâ "music, song, melody" (Mid.Pers. nw'c "to treat kindly, honour," niwag "music, melody;" Proto-Iranian *ni-uac-, from ni- "down; into," → ni- (PIE), + *uac- "to speak, treat kindly").

uniform circular motion
  جنبش ِ دایره‌ای ِ یکدیس، ~ ~ یکنواخت   
jonbeš-e dâyereyi-ye yekdis, ~ ~ yeknavâxt

Fr.: mouvement circulaire uniforme   

The motion of an object around a fixed point at a constant angular speed, and at constant radius.

uniform; → circular; → motion.

uniform field
  میدان ِ یکدیس، ~ ِ یکنواخت   
meydân-e yekdis, ~ yeknavâxt

Fr.: champ uniforme   

A field that at a given instant has the same value at all points within a specified region of interest.

uniform; field.

uniform magnetic field
  میدان ِ مغناتیسی ِ یکدیس   
meydân-e meqnâtisi-ye yekdis

Fr.: champ magnétique uniforme   

A → magnetic field whose direction does not change and whose strength is constant at every point.

uniform; → magnetic; → field.

uniform motion
  جنبش ِ یکدیس، ~ ِ یکنواخت   
jonbeš-e yekdis, ~ yeknavâxt

Fr.: mouvement uniforme   

Motion at a constant → velocity. The state of rest is a special case of uniform motion. → accelerated motion; → inertial motion.

uniform; motion.

uniformitarian
  یکدیسوار   
yekdisvâr

Fr.: uniformitaire   

1) Of, characterized by, or conforming to → uniformity.
2) Of or relating to → uniformitarianism.

uniformity + -arian.

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