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: 13176 Search : in
Apus
  مرغ ِ بهشتی   
Morq-e behešti (#)

Fr.: Oiseau de paradis   

The Bird of Paradise. A constellation in the southern hemisphere, at R.A. = 16 h, Dec. = -75°. Abbreviation: Aps; genitive form: Apodis.

L. apus "a kind of swallow," from Gk. apous "without feet, sand martin," from → a- "without" + pous "foot".

Morq-e behešti "bird of paradise," from morq "bird" + behešt "paradise".

Aquarids
  آبکشیان   
Âbkašiyân

Fr.: Aquarides   

Several → meteor showers that have their → radiants in the constellation → Aquarius. The main showers are:
1) Eta Aquarids, which occurs early in May and is apparently associated with → Halley's comet, and
2) Delta Aquarids occurring in early August.

Aquarids, from → Aquarius constellation + → -ids suffix denoting "descendant of, belonging to the family of."

Âbkašiyân, from Âbkaš + -iyân, → -ids.

Aquarius
  آبکش، ریزنده‌ی ِ آب   
Âbkeš, Rizande-ye âb (#)

Fr.: Verseau   

The Water Bearer. An extended southern constellation composed of rather faint stars (R.A. about 23h, Dec. about -15 deg). One of the signs of the → Zodiac, it is surrounded by → Pegasus, → Equuleus, and → Delphinus to the north, → Aquila to the west, → Pisces Austrinus and → Sculptor to the south, and → Cetus to the east. Abbreviation: Aqr, genitive from: Aquarii.

Aquarius, L. "water carrier," literally "of the water," translation of Gk. Hydrokhoos "the water-pourer," old Gk. name of this constellation.

Âbkeš "water carrier or drawer," from âb "water" (Mid.Pers. âb "water;" O. Pers. ap- "water;" Av. ap- "water;" cf. Skt. áp- "water;" Hitt. happa- "water;" PIE āp-, ab- "water, river;" cf. Gk. Apidanos, proper noun, a river in Thessalia; L. amnis "stream, river" (from *abnis); O.Ir. ab "river;" O.Prus. ape "stream;" Lith. upé "stream;" Latv. upe "brook") + keš "drawer," contraction of kešandé, from kešidan/kašidan "to carry, draw, extract, trail, drag" (Mid.Pers. kešidan "to draw, pull;" Av. karš- "to draw; to plough," karša- "furrow;" cf. Skt. kars-, kársati "to pull, drag, plough," Gk. pelo, pelomai "to be busy, to bustle;" PIE base kwels- "to plow").

Aquila
  شاهین   
Šâhin (#)

Fr.: Aigle   

The Eagle. A constellation on the celestial equator representing an eagle (R.A. about 19h30, Dec. about +5 deg). It is marked by the bright star → Altair (α Aquilae). Abbreviation: Aql, genitive form: Aquilae.

L. aquila "black eagle," fem. of aquilus "dark colored" (bird).

Šâhin "eagle," Av. saêna- "eagle," Skt. śyená- "eagle, falcon, hawk".

Aquila Rift
  چاک ِ شاهین   
câk-e Šâhin

Fr.: Rift de l'Aigle   

A long, dark structure located close to the → Galactic plane and occupying an area between longitudes l ~15° and ~35° and latitudes b ± 10° in the constellations Aquila, Serpens, and eastern Ophiuchus. The Aquila Rift is a complex of dust and → molecular clouds making part of → Gould's Belt in the → Orion Arm. The mass of the molecular gas, derived from → carbon monoxide (CO) observations (Dame et al. 2001, ApJ 547, 792), is in the range ~ 1-3 x 105 → solar masses. A distance of ~260 pc has been estimated for the Aquila Rift, but it is uncertain. Recent Herschel observations have revealed a filamentary structure in the Aquila Rift and the presence of a population of → pre-stellar cores as well as → young stellar objects (André et al. 2010, A&A 518, L102; Bontemps et al. 2010, A&A 518, L85; Könyves et al. 2010, A&A 518, L106).

Aquila; → rift.

Ara
  آتشدان   
Âtašdân (#)

Fr.: Autel   

L. ara "fire altar," from PIE as- "to burn".

Âtašdân "a hearth, a fire-place; a movable coal grate," from âtaš "fire" (from Mid.Pers. âtaxš, âzar-, O.Pers. *âtar-, Av. âtar-, from Indo-Iranian *âtar-, compare with L. âter (feminine âtra) "black" (from "blackened by fire"); PIE *âter) + -dân suffix denoting recipient.

Arabic astronomy
  اخترشناسی ِ عربی   
axtaršenâsi-ye Arabi (#)

Fr.: astronomie arabe   

The astronomical activities that took place from the 8th to the 14th century in the Middle East, Central Asia, North Africa, and Moorish Spain. Arab/Arabic is not meant as an ethnic but rather a linguistic term. In fact a large number of Non-Arab scholars, mainly Persians, Mongols, and Spanish people, wrote their works in Arabic. Even so, many astronomical works were also produced in the other languages of this civilization, especially Persian and in the later centuries Turkish. For example, the main → zijs were originally written in Persian, a notable example being the Zij of Ulugh Beg (c. A.D. 1394-1449), a landmark in precise observations before the Renaissance. Therefore, the term Arabic astronomy is misleading. It also creates a disparity with respect to Western scholars who wrote in Latin. The term "Latin astronomy" is meaningless and as far as these scholars are concerned, the Latin adjective is not specified. For example, the expressions like "the Latin astronomer Copernicus," "the Latin physicist Newton," or "the Latin philosopher Leibniz" are not used. See also → Islamic astronomy.

M.E. arabik, from O.Fr. arabique, from L. Arabicus; → astronomy.

Arago point
  نقطه‌ی ِ آراگو   
noqte-ye Arago

Fr.: point d'Arago   

A → neutral point located at about 20° above the → antisolar point.

Named for François Arago (1786-1853), French physicist; → point

arbitrary
  کامسر   
kâmsar

Fr.: arbitraire   

1) Based on individual will or choice rather than by reason or necessity.
2) Math.: Undetermined; of unspecified value. → arbitrary constant.

M.E., from O.Fr. arbitraire or directly from L. arbitrarius "depending on the will, uncertain," from → ad- "to" + baetere "to come, go."

Kâmsar, literally "at one's will," from kâm "desire, wish; cause, reason," → despite, + sar "person, individual," originally "→ head."

arbitrary constant
  پایای ِ کامسر   
pâyâ-ye kâmsar

Fr.: constante arbitraire   

A constant quantity in → equations which takes various values but which remains unaffected by the changes in the values of the → variables of the equation. Most → differential equations have more than one → solution. In general, the number of arbitrary constants of an ordinary differential equation is given by the → order of the highest → derivative.

arbitrary; → constant.

arborescence
  شاکه‌داری   
šâkedâri

Fr.: arborescence   

1) In → graph theory, a → rooted tree that has a natural orientation in which all → paths are directed away from the → root. More specifically, a → directed graph in which, for a → vertex u, called the → root, and any other vertex v, there is exactly one → directed path from u to v.
2) Biology: The state of being branched, or treelike, in structure, appearance, growth, or other properties.

From Fr. arborescence, from → arborescent + → -ance.

Šâkedâri, nous from šâkedâr, → arborescent.

arborescent
  شاکه‌دار   
šâkedâr

Fr.: arborescent   

Having the shape or characteristics of a tree in growth, structure, or appearance.

From Fr. arborescent, from L. arborescent-, p.p. of arborescere "to grow into a tree," from arbor, arboris "tree."

Šâkedâr "having branches," from šâké, from šâxé, → branch, + dâr "having, possessor," from dâštan "to have, to possess," → charged.

arc
  کمان   
kamân (#)

Fr.: arc   

1) General: Something shaped like a → curve or → arch.
2) Math.: A → segment of a → circle.
3) Electricity: A continuous luminous → discharge across a gap between two → electrodes, as in an arc lamp. → electric arc.
4) Astro.: The apparent path of a celestial body above and below the horizon.

M.E. ark, from M.Fr. arc "bow," from L. arcus "bow, arch" (cf. Goth. arhwazna "arrow," O.E. earh), PIE *arqu- "bowed, curved."

Kamân "arc, bow" from Mid.Pers. kamân, related to xam "curve," cf. Breton kamm "curved, bent," Gk. kampe "a corner, a joint," L. campus "a field," Lith. kampus "corner," PIE *kamb- "to bend, crook."

arc minute
  کمان-دقیقه، دقیقه‌ی ِ کمانی   
kamân-daqiqé, daqiqe-ye kamâni

Fr.: minute de degré   

A unit of angular size equal to 1/60 of a degree.

arc; → minute.

arc of light
  کمان ِ نور   
kamân-e nur

Fr.: arc de lumière   

The apparent angular separation (→ elongation) between the → centers of the → Sun and the → Moon.

arc; → light.

arc of separation
  کمان ِ جدایی   
kamân-e jodâyi

Fr.: arc de séparation   

The difference in → right ascension between the → Sun and the → Moon, measured in degrees.

arc; → separation.

arc of vision
  کمان ِ دید   
kamân-e did

Fr.: arc de vision   

The → angular  → difference in → altitude between the → Sun and the → Moon.

arc; → vision.

arc second
  کمان-ثانیه، ثانیه‌ی ِ کمانی   
kamân-sâniyé, sâniye-ye kamâni

Fr.: seconde de degré   

A unit of angular size equal to 1/3.600 of a degree.

arc; → second.

arc spectrum
  بیناب ِ کمان   
binâb-e kamân

Fr.: spectre d'étincelle   

The spectrum produced by an atom or mixture of atoms as a result of vaporization within an electric arc generated between two electrodes.

arc; → spectrum.

arch
  تاغ   
tâq (#)

Fr.: arc   

1) A curved structure, normally in the vertical plane, that spans an opening.
2) Any overhead curvature resembling an arch. → Arches cluster.

M.E. arch(e), from O.Fr. arche "arch of a bridge," from L. arcus "a bow," → arc.

Taq "arch," from tâk, contraction of târak, → vertex.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB 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 con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>