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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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Number of Results: 639
Expanded Very Large Array (EVLA)
     
EVLA

Fr.: EVLA   

A → radio interferometer array consisting of 27 25-meter diameter antennas located on the Plains of San Agustin in West-Central New Mexico. EVLA will operate at any frequency between 1.0 and 50 GHz and will have a continuum sensitivity improvement over the → VLA by factors of 5 to 20.The EVLA project is expected to be completed in 2012. See also the EVLA homepage.

expand; → very; → large; → array.

expanding Universe
  گیتی ِ گسترا   
giti-ye gostarâ

Fr.: Univers en expansion   

The deduction based on the observational fact that the greater the → distance to a → galaxy, the greater the → redshift in its → spectral lines (→ Doppler effect). The observations strongly indicate that galaxies appear to be moving away from us with speeds proportional to their distance. This is in agreement with the overall → expansion of the → Universe.

expand; → -ing; → Universe.

expansion
  گسترش   
gostareš (#)

Fr.: expansion   

1) General: The act or process of expanding; the state or quality of being expanded.
2) Math.: The process of expressing a quantity, or a quantity expressed, as a sum of a series of terms. For example the expression (2x - 1)(x + 3) can be expanded to: 2x2 + 5x - 3. See also → binomial expansion.

Noun from → expand.

expansion of the Universe
  گسترش ِ گیتی   
gostarš-e giti (#)

Fr.: expansion de l'Univers   

The receding of galaxies from one another at a speed proportional to their separation, as inferred by Edwin Hubble from the observed Doppler shift of distant galaxies. → Hubble constant describes the local rate of the expansion.

expansion; → universe.

expansion parameter
  پارامون ِ گسترش   
pârâmun-e gostareš

Fr.: paramètre d'expansion   

A → scale factor that relates the size of the Universe R = R(t) at time t to the size of the Universe R0 = R(t0) at time t0 by R = aR0. The expansion parameter represents the history of expansion of the Universe.

expansion; → parameter.

expectation
  بیوسش   
bayuseš

Fr.: espérance, attente   

Statistics: Same as → mathematical expectation, → expected value.

From L. expectare "to await, hope," from → ex- "thoroughly" + spectare "to look," from → specere "to look at," → -scope.

Bayusesš, verbal noun of bayusidan "to expect;" Mid.Pers. pyws- "to hope for, desire" (prefixed *pati-); O.Pers. vasiy "at will, greatly, utterly," vašna- "will, favor;" Av. vas- "to will, desire, wish, long for," vasəmi "I wish," vasna- "will, favor," ušti- "desire, wish, will," vasô, vasə "at one's will." This word is extant in several Mod.Pers. dialects, Tabari vessen "to wish, desire," Gilaki vâssan "to wish, desire," vâsti "desire," Kurd. wistin "to desire, wish," Lâri avessa "to desire," colloquial Tehrâni vâsé "for" (Mid.Pers. vasnâd "because"); cf. Skt. vaś- "to wish, want, desire," váśa- "wish, desire," vasēna "for, because;" Gk. ekon "voluntary;" PIE base *uek- "to wish."

expected value
  ارزش ِ بیوسیده   
arzeš- bayusidé

Fr.: valeur espérée   

Statistics: Same as → mathematical expectation, → expectation.

expectation; → value.

expend
  هزینیدن   
hazinidan

Fr.: dépenser   

To use up. See also → spend, → consume.

From L. expendere "to pay out, weigh out money," from → ex- "out" + pendere "to pay, weigh."

Hazinidan, back formation from haziné, → expenditure.

expenditure
  هزینه   
haziné (#)

Fr.: dépense   

1) The act of expending something, especially funds; disbursement; consumption.
2) Something that is expended; expense (Dictionary.com).

From → expend.

Mid.Pers. uzên, uzênag "expense;" ultimately from Proto-Ir. *uz-ayana- literally "going out" (cf. Awromani ziāy-/-zia- "to go out"), from uz-, → ex-, + *Hai- "to go," → efficiency.

experiment
  آزمایش   
âzmâyeš (#)

Fr.: expérience   

An act or operation for the purpose of discovering something unknown or of testing a principle, supposition. See: → Aspect experiment, → Carnal-Mlynek experiment, → Davisson-Germer experiment, → double-slit experiment, → Eratosthenes experiment, → Hafele-Keating experiment, → Hertz experiment, → Michelson-Morley experiment, → Millikan's oil-drop experiment, → Pascal's barrel experiment, → random experiment, → Stern-Gerlach experiment, → thought experiment, → toothed-wheel experiment, → Trouton-Noble experiment, → Young's experiment.

From O.Fr. experiment, from L. experimentum "a trial, test," from experiri "to test, try," from → ex- "out of" + peritus "experienced, tested."

Âzmâyeš, verbal noun of âzmudan, âzmây- "to try, experiment, test;" Mid.Pers. uzmudan, ôzmutan "to test, try, prove;" from O.Pers./Av. *uz-māy-, from uz-, → ex- + mā(y)- "to measure;" from PIE *me- "measure;" cf. Skt. mati "measures," matra "measure;" Gk. metra "lot, portion;" L. metri "to measure."

explain
  اُستاهیدن   
ostâhidan

Fr.: expliquer   

1) To make plain or clear; to render understandable or intelligible.
2) To make clear the cause or reason of; to account for.
3) To assign a meaning to; → interpret.

From L. explanare "to make level, smooth out; make clear," from → ex- "out" + planus "flat; clear."

Ostâhidan, literally "to unfold, spread out" (on the model of Fr. expliquer, Sp. explicar, from L. → ex- "out" + plicare "to lay, fold, twist," from PIE base *plek- "to plait, twist;" cf. Gk. plekein "to plait," L. plectere "to plait, braid, intertwine," O.C.S. plesti "to braid, plait, twist," Goth. flahta "braid"), from os- "out," → ex- + tâh "fold, plait, ply;" Mid.Pers. tâg "piece, part" + -idan infinitive suffix.

explanation
  اُستاهش   
ostâheš

Fr.: explication   

1) The act or process of explaining.
2) A statement made to clarify something and make it understandable.

Verbal noun of → explain.

explicit
  استاهی   
ostâhi

Fr.: explicite   

1) General: Precisely and clearly expressed.
2) Math.: → explicit function.

From Fr. explicite, from L. explicitus "unobstructed," variant p.p. of explicare "unfold, unravel, explain," → explain.

Ostâhi, from ostâh present stem of ostâhidan, → explain, + -i adj. suffix.

explicit function
  کریای ِ استاهی   
karyâ-ye ostâhi

Fr.: fonction explicite   

The most usual form of a function in which the dependent variable (written on the left hand side of the Same as → equality sign) is expressed directly in terms of independent variables written on the left (on the right hand side). See also → implicit function.

explicit; → function.

explode
  اسکفتن، اسکفتیدن   
oskaftan, oskaftidan

Fr.: exploser   

Verbal form of → explosion.

From L. explodere "drive out or off by clapping," originally theatrical, "to drive an actor off the stage by making noise," from → ex- "out" + plaudere "to clap, beat," of uncertain origin.

Oskaftidan, from os-, → ex- + kaftidan "to burst; to split," variants kaftan, kâftan "to split; to dig," Parthian Mid.Pers. q'f- "to split;" Sogdian "to spli;" Chorasmian kf- "to split, be split;" Proto-Iranian *kap-, *kaf- "to split."

exploration
  پویش   
puyeš (#)

Fr.: exploration   

1) An act or instance of exploring or investigating; examination.
2. The investigation of unknown regions.
3) The process of searching for minerals by means of geological studies.
4) Medicine: An examination or investigation for diagnostic purposes, usually involving endoscopy or a surgical procedure.

Verbal noun of → explore.

explore
  پوییدن   
puyidan (#)

Fr.: explorer   

1) To travel to or in a place for the purpose of discovery.
2) To make a careful investigation or study of something.

From L. explorare "investigate, search out;" said to be originally a hunters' term meaning "set up a loud cry," from → ex- "out" + plorare "to cry."

Puyidan, originally "to run, trot; wander," from Mid.Pers. pôy-, pwd- "to run;" cf. Gk. speudein "to hasten;" Lith. spudinti.

explorer
  پوینده، پویشگر   
puyandé, puyešgar (#)

Fr.: explorateur   

A person or thing that explores.

Agent noun of → explore.

explosion
  اسکفت   
oskaft

Fr.: explosion   

The sudden and violent release of mechanical, chemical, or nuclear energy from a confined space which creates a heat wave that travels at → subsonic speeds. → detonation; → deflagration; → implosion.

Verbal noun of → explode.

explosive
  ۱) اسکفتاک؛ ۲) اسکفتی، اسکفتنده   
1) oskaftâk; 2) oskafti, oskaftandé

Fr.: explosif   

1) (n.) A chemical or compound that causes a sudden, almost instantaneous release of pressure, gas, heat, and light when subjected to sudden shock, pressure, high temperature, or applied potential.
2) (adj.) Pertaining to or of the nature of an → explosion.

From explos(ion), → explosion + → -ive.

Oskaftâk, from oskaft-, stem of oskaftan, → explode, + -âk noun suffix.

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