An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 12934 Search : far
associate
  ۱) آهزیدن؛ ۲) آهزیده شدن؛ ۳) آهزگار   
1) âhazidan; 2) âhazide šodan; 3) âhazgâr

Fr.: 1a) associer; 1b) s'associer; 2) associé; allié   

1) (v.tr.) To join or connect together; to bring together or into relationship in any of various intangible ways (as in memory or imagination). → dissociate.
2) (v.intr.) To come or be together as partners, friends, or join with other parts.
3) A person joined with another or others in business or at work; something that usually accompanies another thing.

M.E. associat "associated," from L. associatus, p.p. of associare "to unite," from ad- + sociare "to join," from socius "ally, companion" ("follower"); PIE base *sekw- "to follow."

Âhazidan, from â- prefix + hazidan "to associate, accompany, follow," from Av. hac-, hax- "to associate, follow, accompany" (hacenay- "getting together, association," haxay-, hašy-, haš- "friend"), hacaiti "follows;" hacā "from, out of;" O.Pers. hacā "from" (Mid.Pers. hâz- "to lead, guide," hac "from;" Mod.Pers. az "from"); PIE base *sekw- "to follow;" cf. Skt. sac- "to be associated or united with," sácate "accompanies, follows," sácā "with;" Gk. hepesthai "to follow;" L. sequi "to follow."
Âhazgâr, from âhaz- present stem of âhazidan + agent noun suffix -gâr, → -or, as in âmuzgâr, parhizgâr, sâzgâr, âmizgâr, sepuzgâr.

associated molecular cloud
  ابر ِ مولکولی ِ آهزیده   
abr-e molekuli-ye âhazidé

Fr.: nuage moléculaire associé   

A → molecular cloud that is physically or apparently related to a star formation region.

associate; → molecular; → cloud.

association
  آهزش؛ انجمن   
âhazeš; anjoman (#)

Fr.: association   

1) The act of associating, → associate; the state of being associated.
2) A group of → astronomical objects physically or apparently gathered in a particular area of sky, for example an → stellar association.
3) An organization of persons having a common interest. → dissociation.

Association, noun from → associate.

Âhazeš, verbal noun of → âhazidanassociate. Anjoman, for the meaning 3, from Mid.Pers. anjaman, from Av. han-jamana, from han- "together" + jamana, from gam- "to come;" cf. Skt. samgamana "gathering together."

association member
  هموند ِ آهزش   
hamvand-e âhazeš

Fr.: membre d'une association   

A celestial body making part of an astronomical association.

association; → member.

associative
  آهزشی، آهزنده   
âhazeši, âhazandé

Fr.: associatif   

1) Of, characterized by, resulting from, or causing association.
2) In a mathematical operation, being independent of the sequence in which the elements are grouped. For ex., if a + (b + c) = (a + b) + c, the operation indicated by + (addition) is associative.

Adj. from associate.

associative algebra
  جبر ِ آهزشی   
jabr-e âhazeši

Fr.: algèbre associative   

An algebra whose multiplication is associative.

associative; → algebra.

associative axiom
  بنداشت ِ آهزش   
bondâšt-e âhazeš

Fr.: axiome d'associativité   

A basic rule in → group theory stating that if a, b and c are members of a group then (a * b) * c and a * (b * c) are members of the group.

associative; → axiom.

associative law
  قانون ِ آهزشی   
qânun-e âhazeši

Fr.: loi associative   

In mathematics, the rule that states that the result of two identical operations is independent of the sequence of these operations. For ex., in the addition operation, a + (b + c) = (a + b) + c = a + b + c. Multiplication of numbers is also associative.

associative; → law.

associativity
  آهزندگی   
âhazandegi

Fr.: associativité   

Of or relating to association; state of being associative.

associative + → -ity.

assume
  آگربیدن، فرض کردن، فرضیدن   
âgarbidan, farz kardan, farzidan (#)

Fr.: supposer   

To take as granted or true; suppose.

M.E., from L. assumere "to take up," from ad- "to, up" + sumere "to take," from sub "under" + emere "to take."

Âgarbidan, from âgarb, → assumption.

assumption
  آگرب، فرض   
âgarb, farz (#)

Fr.: supposition   

A fact or statement (as a proposition, axiom, postulate, or notion) taken for granted.

M.E., from L.L. assumption, assumptio "taking up," from L. assumere, → assume.

Âgarb, from â-, nuance prefix, + garb, from Av./O.Pers. grab-, Av. gərəb- "to take, to seize;" cf. Mod.Pers. gereftan "to take; to assume;" Skt. grah-, grabh- "to seize, to take," graha "seizing, holding, perceiving;" M.L.G. grabben "to grab;" E. grab "to take or grasp suddenly;" PIE *ghrebh- "to seize."
Ar. farz "assumption, hypothesis."

assurance
  آتنزش   
âtenzeš

Fr.: assurance   

A positive declaration intended to give confidence; promise or pledge; guaranty; surety (Dictionary.com).

assure; → -ance.

assure
  آتنزیدن   
âtenzidan

Fr.: assurer   

1) To declare earnestly to; inform or tell positively; state with confidence to.
2) To give confidence to; encourage.

M.E. as(e)uren, assuren, from O.Fr. aseurer, from L.L. assecurare, from as-, variant of → ad-, + secur-, → secure, + -a- thematic vowel, + -re infinitive suffix.

Âtenzidan, from â- intensive prefix, + tenz, → sure, + -idan infinitive suffix, → -ize.

asterisk
  اخترک   
axtarak

Fr.: astérisque   

A small starlike symbol (*), used in printing or writing as a reference mark, as an indication of the omission of letters or words, to denote a hypothetical linguistic form, or for various arbitrary meanings.

M.E. astarisc, from L.L. asteriscus, from Gk. asteriskos "small star," from aster-, → astro- + -ikos "diminutive suffix."

Axtarak, from axtar "star" → astro- + -ak "diminutive suffix."

asterism
  اخترگان   
axtargân

Fr.: astérisme   

A group of stars in the sky which are traditionally imagined to present a pattern within a → constellation. Examples include the → Big Dipper, the → Northern Cross, the → Square of Pegasus, and → Orion's Belt.

Gk. asterismos "a marking with stars, constellation," from aster, → astro- + → -ism.

Axtargân, from axtar "star" → astro- + -gân suffix denoting collective nature.

asteroid
  ۱) سیارک؛ ۲) اختروار   
1) sayyârak (#); 2) axtarvâr

Fr.: astéroïde   

1) A small rocky object orbiting the Sun. There are millions of asteroids moving in orbits in the main → asteroid belt, between → Mars and → Jupiter and in the → Kuiper belt. The largest and the first discovered, → Ceres, about 1,000 km in size, is now classified as → dwarf planet (2006 IAU General Assembly). The largest asteroid in the solar system (Ceres apart), is → Pallas, with a size of 582 × 556 × 500 km. On the other hand, the smallest asteroid ever studied is the 2 meters space rock 2015 TC25, which was observed when it made a close flyby of Earth in October 2015. See also → near-Earth asteroid; → binary asteroid.
2) Math.: A → hypocycloid with four → cusps in which the → radius of the rolling → circle is a → quarter of the radius of the fixed circle. It has the → parametric equations x = a cos3θ, y = a sin3θ, where a is the radius of the fixed circle.

Gk. asteroeides "star-like," from aster, → astro- + → -oid "like, resembling."

Sayyârak "small planet," from sayyâré, → planet, + -ak "diminutive suffix."
Axtarvâr, from axtar, → astro-, + -vâr, → -oid.

asteroid belt
  کمربند ِ سیارکها   
kamarband-e sayyârakhâ

Fr.: ceinture des astéroïdes   

The region of the → solar system located between → Mars and → Jupiter where over a million objects bigger than 1 km across orbit the Sun. Another region populated by minor bodies lies beyond the orbit of → Neptune, the → Kuiper belt.

asteroid; → belt.

asteroid designation
  نامگزینی ِ سیارک   
nâmgozini-ye sayyârak

Fr.: désignation des astéroïdes   

1) For an asteroid whose orbit is precisely known, a number and optionally a proper name, e.g. (7) Iris, (24101) Cassini, (99942) Apophis.
2) For an asteroid whose orbit is not known, a provisional designation composed of four elements: number.letter.letter.(optionally)number. The first number indicates the year of discovery. The first letter denotes the half-month of the discovery (A: first half of January, Y: second half of December; the letter "I" is excluded). The second letter and the following number indicate the order of discovery within the half-month. For example, the first asteroid discovered in the first half of May 1960 is: 1960 JA. Since more than 25 objects (without "I") might be detected within a half-month, the number following the second letter indicates the number of 25 discoveries. Hence, 2001 SD3 was discovered in the second half of September 2001 and was the (D =) 4 + (25 x 3) or the 79th object found during that period.

asteroid; → designation.

asteroid family
  خانواده‌ی ِ سیارکها   
xânevâde-ye sayyârakhâ

Fr.: famille d'astéroïde   

A group of asteroids that share the same or similar proper orbital elements (semi-major axis, eccentricity, inclination). In 1918, the Japanese astronomer K. Hirayama first recognized some non random concentrations of asteroid elements. He noticed that certain "groups" of asteroids had similar orbital elements, and hence he first introduced the concept of "asteroid families," and identified three of them: Koronos, Eos, and Themis. The names of these groups were chosen by the parent (brightest) asteroid that the smaller group asteroids follow. Some of the more common asteroid families include the Trojans, which are actually not an asteroid family, but a group of asteroids caught in the Sun-Jupiter gravitational equilibrium points known as L3 and L4 → Lagrangian points.

asteroid; → family.

asteroid survey
  بردید ِ سیارکها   
bardid-e sayyarakhâ

Fr.: recherche systématique d'astéroïdes   

Systematic observation of the sky in particular searching for → asteroids that may have a close approach to the Earth. → near-Earth object.

asteroid; → survey.

Bardid, → survey; sayyârakhâ plural of sayyârak, → asteroid.

<< < -es -iv -ti 217 A s abe abs abs acc acc Ach act act ADa adi adv aff age Alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg arm art ass ast ast ast atm ato att aur aut axi B-t Bai Bal bar bar Be bed Bes BHB bif bim bin Bio bis bla ble blu bod Bol bor bou bra Bre bro Bul cag cal can Can car Car Cas cat CCD cel cen Cet cha cha che che chr cir cir cit cla clo clo clu Coa coe coh col Col col com com com com com com com com com con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cum cur cyc d'A dar dat DB dea dec dec dec def def deh del den dep des det deu dia dif dif dif dim dip Dir dis dis dis dis dis div dom dou dou dri duo dus dyn dyn ear eas ecl Edd eff Ein eje ele ele ele ele ell emb emi enc ene ent eph equ equ equ eru eth Eul eve ewe exc exc exi exo exp ext ext ext fab fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre Fre fro fus G t gal gal Gam gas Gau Gem gen geo geo geo gia gla God gra gra gra gra Gre Gre gue GZK Haf hal har har He hea hel hel Her Her hid hig hip hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima imp imp imp inc ind ind ine inf inf inf ini ins ins int int int int int int int int inv inv ion iro Isl iso iso Jac jet jud jur Kel Kep kil Klo kur Lag lam Lap Lar lat law lea len lep lib lig Lin lin lin liq lit loc log lon Lor low lum lun Lut Lyo mac mag mag mag Mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil min mir mix mod mol mom Moo mos Mu mul mus nad nas nat neb neg net neu New New nig Noe non non non nor nuc nuc nul nut Obe obl obs occ Oct off old one ope opp opt opt orb ord org Ori osc oth ova oxi P-w pal par par par par Pas pat pej per per per per per per pha phi pho pho pho phy pin Pla pla pla pla pla plu Poi pol pol pol poo pos pos pot pra pre pre pre Pre pri pri pro pro pro pro pro pro pro pse pul Pur qua qua qua qua que rad rad rad rad rad rad raf ran rar ray rea rea rec rec red red ref ref reg rel rel rel rep res res res res ret rev ric rig rin roc ROS rot Rox rus Sad sam sat sca sca Sch sci sea sec sec see sel sem sen ser Sgr sha shi sho sid sig sim sin Sir ske sli Smo soc sol sol sol Sol Som sou spa spa spe spe spe sph spi spi Spo squ sta sta sta sta Ste ste ste Sto str str str sub sub suc sun sup sup sup sup sur Swa syn syn tac tas tel tem ter tes the the the the Tho thr tid tim tit top tot tra tra tra tra tre tri Tro tru tun tut Tyn typ ult unb und uni uni uns ups Urv vag van vec vei Ven ver Vic Vir vir vis vol W b war wav wav wea wee Wey Wid win WN2 Wol wro XMM YOR zen zir > >>