An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



<< < -ab ab- abo abs abs acc acc aco act ad add adj aeo afo agr Alf alg alk Aln alr alt amb ana And ang ani ano ant Ant ape apo app app arb are ari art ass ast ast ast atm ato att aut ave axi > >>

Number of Results: 929
jabri (#)

Fr.: algébrique   

Relating to, involving, or according to the laws of algebra.

algebra + → -ic.

algebraic equation
  هموگش ِ جبری   
hamugeš-e jabri

Fr.: équation algébrique   

An equation in the form of P = 0, where P is a → polynomial having a finite number of terms.

algebra; → equation.

algebraic function
  کریای ِ جبری   
karyâ-ye jabri

Fr.: fonction algébrique   

A function expressed in terms of → polynomials and/or roots of polynomials. In other words, any function y = f(x) which satisfies an equation of the form P0(x)yn + P1(x)yn - 1 + ... + Pn(x) = 0, where P0(x), P1(x), ..., Pn(x) are polynomials in x.

algebraic + → function.

algebraic number
  عدد ِ جبری   
adad-e jabri (#)

Fr.: nombre algébrique   

A number, → real or → complex, that is a → root of a → non-zero polynomial equation whose → coefficients are all → rational. For example, the root x of the polynomial x2 - 2x + 1 = 0 is an algebraic number, because the polynomial is non-zero and the coefficients are rational numbers. The imaginary number i is algebraic, because it is the solution to x2 + 1 = 0.

algebraic; → number.

Algenib (γ Pegasi)
Aljanb (#)

Fr.: Algenib   

A star which lies at the lower left-hand corner of → Pegasus. Its apparent magnitude varies between +2.80 and +2.86 over a period of 3.6 hours; → spectral type B2 IV.

Algenib, from Ar. Aljanb al-Faras "the horse's flank," from al "the" + janb "flank" + faras "horse".

Algieba (γ Leo)
Jebhé (#)

Fr.: Algieba   

A binary system in Leo the brighter component of which (magnitude 2.6) is a giant K star and the partner a giant G (magnitude 3.8). The angular separation of just over 4'' means that the two stars are at least 170 AU apart, for a distance of 126 → light-years, and have an orbital period of over 500 years.

Algieba, from Ar. Al-Jabhah "the forehead" (of the Lion).

Algol (β Persei)
  الغول، رأس‌الغول   
Alqul, Ra's-ol-Qul (#)

Fr.: Algol   

A variable star in the constellation → Perseus, which was the first eclipsing binary discovered. Its brightness varies between 2.2 and 3.5 magnitudes. Lying at a distance of about 82 → light-years, it consists of at least three components. The brightest component (A) is of spectral type B8 V, and the second one (B) a K type giant. The components A and B turn around each other with a period of about 68.8 hours.

Algol, from Ar. Ra's al-ghul "the ghoul's head".

Algol-type variables
  ورتندگان ِ الغولگونه   
vartandegân-e Alqulguné

Fr.: variables de type Algol   

The same as eclipsing binary stars, the prototype of which is Algol.

Algol; → variable.

xârazmik (#)

Fr.: algorithme   

1) A step-by-step problem-solving procedure, especially an established, recursive computational procedure for solving a problem in a finite number of steps.
2) Historically, the Arabic system of arithmetical notation (with the figures 1, 2, 3, etc.); the art of computation with the Arabic figures, one to nine, plus the zero; arithmetic.

From M.L. algorismus, a mangled transliteration of al-Khwarizmi, "native of Khwarazm," the surname of the Persian mathematician and astronomer Abu Ja'far Mohammad ibn Musa al-Khwarizmi (c780-c850).

Xârazmik, from Xârazmi (or Xwârazmi, from Xwârazm), the name of the Persian mathematician, + Persian affix → -ik, → -ics.


Fr.: alias   

General:An assumed name; otherwise called.
Electronics: A false signal in telecommunication links from beats between signal frequency and sampling frequency.

From L. alius "(an)other". Compare with Skt. anya "other, different," Av. anya-, O.Pers. aniya- "the one or the other," Arm. ail, Gk. allos "another," Goth. aljis "other". PIE *al- "beyond".

Anyâ from Mid.Pers. anya "other, otherwise," from Av. anya "other". This term is used as eyni in the Modern Persian Aftari dialect: eyni sâl "other year," eyni vacé "other child".


Fr.: réplication   

The condition that two or more functions are indistinguishable because they have the same values at a finite set of points. Such functions are said to be aliases of each others. The aliasing problem often occurs in undersampled discrete Fourier transform.

Aliasing, from → alias + → -ing.

Anyâyi, from anyâ, → alias, + noun forming suffix -i.

ezâdé (#)

Fr.: alidade   

1) In a → planispheric astrolabe, the small revolving rod fixed to the center of the goniometric scale plotted on the → front or → back of the instrument. Unlike the → rule, the alidade has little vanes with holes or slots at each end, called → pinnules, which are used as sights, through which the observer can aim at a particular object. An index, often consisting of the edge of the alidade itself, shows on the goniometric scales the angle between the line of sight of the targeted object and a predetermined axis, i.e. the vertical of the observation locality (online museo galileo, VirtualMuseum).
2) A rule having a sight at each end, used in surveying.
3) A topographic surveying and mapping instrument used for determining directions, consisting of a telescope and attached parts.

M.E. allidatha, alhidade, from L. alhidada, from Ar. al-'izâda (العضاده), from al- "the" + 'izâda "an armlet, a bracelet; a sickle-like piece of metal, used by camel drivers, to pull down tree branches to camels."

Ezâdé, from Ar. al-'izâda.

  بیگانه، بیگان   
bigâné (#), bigân

Fr.: 1) espèce envahissante; 2) extraterrestre   

1) A species not native to its environment; an introduced species.
2) A hypothetical creature from outer space; → extraterrestrial.

M.E., from O.Fr. alien "strange, foreign; a stranger, foreigner," from L. alienus "of or belonging to another, foreign, alien, strange," also, as a noun, "a stranger, foreigner," adjectival form of alius "(an)other," → alias; meaning "not of the Earth" first recorded 1920.

Bigâné "alien, foreigner," from Mid.Pers. bêgânag, from bêg-, bê- "out, outside, apart" (cf. Sogd. bêk "out, outside, apart, except," bêk-dênê "heretic," literally "out of religion") + suffix -ânag.

  آختیدن، آخطیدن   

Fr.: aligner   

To arrange in a line or so as to be parallel; to adjust to produce a proper relationship or orientation.

M.Fr. aligner, from O.Fr. aligner, from à "to" + ligner "to line," from L. lineare, from linea "linen thread, string, line;" → line.

Âxatidan, from â- intesive and nuance prefix + xat, → line, + infinitive suffix -idan.

align a telescope
  آختیدن ِ دوربین، ~ تلسکوپ   
âxatidan-e durbin, ~ teleskop

Fr.: aligner un télescope   

Setting the axis of a telescope parallel to prime directions. In equatorial mounting, they are made parallel with the Earth's axis of rotation and the equator respectively. → collimation.

align; → telescope.


Fr.: aligné   

Arranged in a → straight line.

Past participle of → align.

aligned magnetic field
  میدان ِ مغناطیسی ِ آختیده   
meydân-e meqnâtisi-ye âxatidé

Fr.: champ magnétique aligné   

A magnetic field whose lines of force are oriented along a particular direction or by a particular manner (axially, vertically; randomly, properly, etc.)

aligned; → magnetic field.

  آختش، آخطش   

Fr.: alignement   

The fact of being in line or bringing into line.

Verbal noun of → align; → -ment.

Alioth (ε Ursae Majoris)
Jown (#)

Fr.: Alioth   

The brightest of the seven stars that make up the → Big Dipper → asterism. Alioth shines at magnitude +1.77 from a distance of about 80 → light-years. It is a white star of → spectral type A0pCr. The spectrum of the star is characterized by abnormally strong lines of → chromium and → europium.

Alioth, from Aliot, from Ar. Alyat (الیه) "tail, buttocks".

Jown, from Ar. Jawn "black camel or horse".

Alkaid (η Ursae Majoris)
Qâed (#)

Fr.: Alkaïd   

The second brightest star in → Ursa Major and the end star in the handle of the → Big Dipper. Alkaid is a blue B3V main sequence star of apparent magnitude of 1.86 and lies at about 100 → light-years.

Alkaid "leader, chief," from Al-Qa'id al-Banat an-Na'ash "the leader of the daughters of the bier," from Banat "daughters" + Na'ash "bier". Banat an-Na'ash is the Ar. name of the constellation.

Qâed from Ar. Al-Qa'id.

<< < -ab ab- abo abs abs acc acc aco act ad add adj aeo afo agr Alf alg alk Aln alr alt amb ana And ang ani ano ant Ant ape apo app app arb are ari art ass ast ast ast atm ato att aut ave axi > >>