An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 658
exponential curve
  خم ِ نمایی   
xam-e nemâyi (#)

Fr.: courbe exponentielle   

A curve that represents an → exponential function.

exponential; → curve.

exponential equation
  هموگش ِ نمایی   
hamugeš-e nemâyi

Fr.: équation exponentielle   

An equation in which unknowns appear as exponents. Examples: 23x + 1 = 32.

exponential; → equation.

exponential function
  کریای ِ نمایی   
karyâ-ye nemâyi

Fr.: fonction exponentielle   

A function in the form of y = bx defined for every → real number x, with positive base b > 1.

exponential; → function.


Fr.: exponentiellement   

In an exponential manner.

exponential; → -ly.

  ۱) اسبرتیدن؛ ۲) اسبرت   
1) osbartidan; osbart

Fr.: export   

1a) To ship (commodities) to other countries or places for sale, exchange, etc.
1b) Computers: To save (documents, data, etc.) in a → format usable by another → software program.
2) The act of exporting (

From L. exportare "to carry out, bring out; send away,," from → ex- "away" + portare "carry."

Osbart "carrying away," from os-, → ex-, + bart variant of bord, bordan "to carry" (such as in dialects of Varzaneh barte, Nâin barte, Xonsâr birt, Esfahân bärten); Mid.Pers. burdan; O.Pers./Av. bar- "to bear, carry," barəθre "to bear;" Skt. bharati "he carries;" Gk. pherein; L. fero "to carry;" PIE base *bher- "to carry."

  نور دادن   
nur dâdan (#)

Fr.: exposer   

In imaging, to subject, as to the action of light, or other electromagnetic radiations.

From M.Fr. exposer "to lay open, set forth," from L. exponere "to put forth; explain," from → ex- + ponere "to put, place."

nur dâdan, from nur, → light + dâdan "to give," Mid.Pers. dâdan "to give;" O.Pers./Av. dā- "to give, grant, yield," dadāiti "he gives;" cf. Skt. dadáti "he gives;" Gk. didomi "I give;" L. dare "to give, offer;" PIE base *do- "to give."


Fr.: pose, exposition   

The act of exposing; the fact or state of being exposed, → expose.
In optics, the total radiant energy incident on a surface per unit area. It is equal to the integral over time of the radiant flux density.

Verbal noun of → expose.

exposure meter
  نورداد سنج، نور سنج   
nurdâd sanj, nur sanj

Fr.: posemètre   

In photography, an instrument used to measure the intensity of light from a scene to be photographed and to indicate the camera lens and shutter settings required to expose the film correctly.

exposure; → meter.

exposure time
  زمان ِ نورداد   
zamân-e nurdâd

Fr.: temps de pose   

The length of time during which the receiver is irradiated.

exposure; → time.


Fr.: exprimer   

1) To transform ideas into words; utter or state.
2) Math: To → transform into equivalent → terms. For example by → expanding or → factorizing an → expression. See also → suppress, → impress.

M.E. expressen, O.Fr. espresser "to press, squeeze out; speak one's mind," M.L. expressare, frequentative of exprimere "represent, describe," literally "to press out," from → ex- "out" + pressare "to press, push," from L. premere "to press, hold fast, cover, compress."

Zohâvidan, from zo- variant of os- "out," → ex-, + hâv, from Av. hau- "to press, squeeze out;" cf. Mid.Pers. hunîdan "to express, extract (juice)," hâwan "mortar;" akin to Skt. sav- "to press, press out;" O.H.G. sou, O.E. sēaw "juice;" + -idan infinitive suffix.


Fr.: expression   

1) The act or an instance of expressing.
2) Math.: A statement using mathematical quantities such as → scalars, → variables, → parameters, → functions, and → sets, as well as → relational and → logical  → operators such as → equality, → conjunction, → existence, → union, etc. (Steven. G. Krantz, ed., Dictionary of Algebra, Arithmetic, and Trigonometry, 2001).

express; → -tion.

ostanidan (#)

Fr.: étendre   

To stretch out; draw out to the full length; to enlarge the scope of; to increase the length or duration of.

From O.Fr. estendre, from L. extendere "stretch out," from → ex- "out" + tendere "to stretch," see below.

Ostanidan, from os-, → ex- + tanidan as in Av. ustāna- "stretched out" (ustāna-zasta- "with outstretched hands"), cf. Skt. uttāná- "stretched out, spread out." Mod.Pers. tanidan "to spin, twist, weave;" Mid.Pers. tanitan, from Av. tan- to stretch, extend;" cf. Skt. tan- to stretch, extend," tanoti "stretches," tantram "loom;" Gk. teinein "to stretch, pull tight;" L. tendere "to stretch;" PIE base *ten- "to stretch."

extended object
  بر‌آخت ِ استنیده   
barâxt-e ostanidé

Fr.: objet étendu   

An object whose angular size exceeds the resolution of the instrument used to observe it.

extended; → object.

extended source
  خن ِ استنیده   
xan-e ostanidé

Fr.: source étendue   

In radio astronomy, a source whose angular extent could be measured, as distinguished from a point source.

extended; → source.

ostaneš (#)

Fr.: extension   

An act or instance of extending; the state of being extended.
Physics: That property of a body by which it occupies space.
Math.: A filed F is said to be an extension of a field K if K is a subfield of F.

Verbal noun of → extend.

biruni (#)

Fr.: externe   

Of or pertaining to the outside or outer part.

M.E., from M.Fr. externe or directly from L. externus "outside, outward," from exterus, a comparative of → ex-, + → -al.

Biruni, adj. from birun "out, the outside," → out.

external photoelectric effect
  اسکر ِ شید-برقی ِ برونی   
oskar-e šid-barqi-ye boruni

Fr.: effet photoélectrique externe   

The → photoelectric effect in solids where free electrons are emitted from the surface of a substance (e.g., → semiconductor) when radiation of appropriate frequency falls on it. Also called → photoemissive effect.

external; → photoelectric; → effect.

external work
  کار ِ بیرونی   
kâr-e biruni

Fr.: travail externe   

The work done by a thermodynamic system as it expands against its surrounding environment. It is equal to ∫pdV, where p is the applied external pressure and V the volume, integrated from the initial V1 to final V2.

external; → work.


Fr.: extériorisation   

Verbal noun of → externalize.

externalize + → -tion.


Fr.: intériorisation   

1) To make external; embody in an outward form.
2) To regard or treat as being caused by externals; attribute to external causes (

external + → -ize.

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