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: 705
regular reflection
  بازتاب ِ باسامان   
bâztâb-e bâsâmân

Fr.: réflexion régulière   

The reflection of light when the reflecting surface is very smooth and the reflected rays bounce off parallel to each other. Opposite of → diffuse reflection; same as → specular reflection.

regular; → reflection.

regular satellite
  بنده‌وار ِ باسامان، ماه ِ ~   
bandevâr-e bâsâmân, mâh-e ~

Fr.: satellite régulier   

A satellite that revolves around its planet in an equatorial orbit of low or moderate eccentricity close to the planet. One example of a regular satellite system is the Galilean satellites of Jupiter.

regular; → satellite.

regulate
  رزنیدن   
razanidan

Fr.: réguler   

To control, direct, or adjust by a rule, principle, method, etc.

From L.L. regulatus, p.p. of regulare "to control by rule, direct," from L. regula, cognate with Pers. râstright.

Razanidan, verbal form of razan, → rule, cognate with L. regula.

regulated
  رزنیده   
razânidé

Fr.: régulé, réglementé   

Controlled or governed according to a rule or principle or law.

Past participle of → regulate.

regulation
  رزنش   
razaneš

Fr.: régulation   

1) The act of regulating; the state of being regulated.
2) A law, rule, or other order prescribed by authority.
3) Electronics: The degree by which a voltage source is held near its no-load amplitude when a load is applied.

Verbal noun of → regulate.

regulator
  رزنگر   
razângar

Fr.: régulateur   

A person or thing that regulates.
A governor mechanism for regulating the flow of fuel, steam, etc., to an engine in order to maintain constant speed under varying load or resistance.

Agent noun of → regulate.

Regulus (α Leonis)
  شیردل   
Širdel

Fr.: Régulus   

The brightest star in the constellation → Leo (V = 1.35). Regulus is approximately 77.5 light-years from Earth. It is a triple star system composed of a hot, bluish-white star with a pair of small, faint companions. The main star (Regulus A) is a main sequence of type B7, with a luminosity 140 times brighter than the Sun. Its equatorial rotation speed being 317 kilometers per second, the fast rotation distorts Regulus into an oblate spheroid with an equatorial diameter about 30 percent larger than the polar diameter. As a result, the poles, with a temperature of 15,400 Kelvin, are much hotter than the equator, which glows at 10,200 Kelvin.

L., literally "little king," diminutive of rex "king," related to regere "to keep straight, guide, lead, rule," from PIE base *reg- "to rule, to lead straight, to put right;" akin to Pers. râst "right, straight, correct," → right.

Širdel, literally "the Lion's heart," on the model of Ar. Qalb al-Asad (قلب‌الاسد), from šir "lion;" Mid.Pers. šagr "lion" + del "heart;" Mid.Pers. dil; Av. zərəd- "heart;" cf. Skt. hrd-; Gk. kardia; L. cor Arm. sirt; PIE base *kerd- "heart;" O.E. heorte; E. heart; Ger. Herz; Bret. kreiz "middle."

reionization
  بازیونش   
bâzyoneš

Fr.: réionisation   

An early epoch in the Universe's history, but after → recombination, when the → first stars formed and their ultraviolet light began to ionize the → neutral hydrogen gas that filled the Universe. The epoch of reionization is estimated to last between → redshifts of 12 to 6 (or when the Universe had between 2 and 5% of its age). Reionization marks the end of the → Dark Age in cosmic history.

re- + → ionization.

Reissner-Nordstrom black hole
  سیه‌چال ِ رایسنر-نوردستروم   
siyah câl-e Reissner-Nordström

Fr.: tou noir de Reissner-Nordström   

A type of electrically charged → black hole that is spherically symmetric and non-rotating. Another type of such objects is the → Kerr-Newman black hole.

Named after the German physicist Hans Jacob Reissner (1874-1967) in 1916 and the Finnish Gunnar Nordstrom (1881-1923) in 1918 independently worked out solutions different from those of Schwarzschild; → black hole.

reject
  واشاندن   
vâšândan

Fr.: rejeter   

To refuse to accept, take, consider, recognize, etc.

re- + jec-, combining form of jacere "to throw" + -tus p.p. suffix, → project.

relate
  ۱) بازانیدن؛ ۲) بازانش داشتن   
1) bâzânidan; 2) bâzâneš dâštan

Fr.: 1) établir un rapport entre, rapprocher; 2) se rapporter   

1) (tr.) To find or show a connection between two or more people or things.
2) (intr.) To have a significant connection with or bearing on something.

From O.Fr. relater, from L. relatus literally "carried, brought back," from re- "back, again" + latus "carried, brought," used as p.p. of referre, from re- "back, again" + ferre "carry, bear," cognate with Pers. bordan "to carry, bear" (Mid.Pers. burdan, O.Pers./Av. bar- "to bear, carry," barəθre "to bear (infinitive)," Skt. bharati "he carries," Gk. pherein, L. fero "to carry;" PIE base *bher- "to carry").

Bâzânidan, literally "to bring, lead back," from bâz- "back, again," → re- + ân stem of ânidan "to bring; to lead; to guide," cf. dialectical Kurd. ânin "to bring, to lead to," Tâleši ânân, ânoe "to bring together two edges;" Mid.Pers. ônidan, nidan, nay- "to lead; to bring;" O.Pers. nay- "to lead; to bring" anaya "leads;" Av. nay- "to lead; to bring," naiieiti "leads;" cf. Skt. nī- "to lead," náyati "leads," aorist s. anait.

related
  بازانیده   
bâzânidé

Fr.: apparenté   

Connected; associated.

P.p. of → relate.

relation
  بازانش   
bâzâneš

Fr.: relation   

General: A connection or association between two or more things.
Math.: A property that associates two quantities in a definite order, as equality or inequality.

Verbal noun of → relate.

relation symbol
  نماد ِ باز‌آنش   
nemâd-e bâzâneš

Fr.: symbole de relation   

Same as → predicate symbol.

relation; → symbol.

relational
  بازانشی   
bâzâneši

Fr.: relationnel   

Of or pertaining to relations.

relation + → -al.

relational data structure
  ساختار ِ داده‌های ِ بازانشی   
sâxtâr-e dâdehâ-ye bâzâneši

Fr.: structure de données relationnelle   

A type of data structure in which data are represented as tables in which no entry contains more than one value.

relational; → data; → structure.

relational system
  راژمان ِ بازانشی   
râžmân-e bâzâneši

Fr.: système relationnel   

A database management system in which a relational data structure is used.

relational; → system.

relative
  بازانی   
bâzâni

Fr.: relatif   

(adj.): Existing or having its specific nature only by relation to something else; not absolute or independent.
See also: → relative azimuth, → relative dating, → relative density, → relative error, → relative frequency, → relative humidity, → relative invariant, → relative tensor, → relative vector, → relative permeability, → relative refractive index, → relative sunspot number, → relative velocity, → relatively, → relativity.

From M.E. relatif (n.), from O.Fr. relatif, from L.L. relativus "having reference or relation," from L. relatus, suppletive p.p. of referre "to refer," → relate.

Bâzâni, from bâzân- present stem of bâzânidan, → relate, + -i adj. suffix.

relative azimuth
  سوگان ِ بازانی   
sugân-e bâzâni

Fr.: azimut relatif   

The difference in → azimuth between the → Moon and the → Sun.

relative; → azimuth.

relative dating
  سن‌یابی ِ بازانی   
senn-yâbi-ye bâzâni

Fr.: datation relative   

A method of dating that can only tell us whether an event or object is older or younger than another event or object. In geology, different layers of rock are compared to determine an ordered sequence of events in geologic history. In contrast to → absolute dating, relative dating cannot give the actual age of a rock. See also → stratigraphy.

relative; → dating.

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