An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13116 Search : far
Draco Dwarf
  کوتوله‌ی ِ اژدها   
kutule-ye eždahâ

Fr.: Naine du Dragon   

A dwarf elliptical galaxy that is a satellite of our Galaxy and lies at a distance of about 250,000 light-years from the Galactic center. Its diameter is only about 3,500 light-years, and its absolute magnitude -8.6, making it the least luminous galaxy known.

Draco; → dwarf.

draconic month
  ماه ِ گوزهری، ~ ِ گرهی   
mâh-e gowzahri (#), ~ gerehi (#)

Fr.: mois draconitique   

The time interval between two successive passages of the Moon through its → ascending node, 27.212 220 days (27d 5h 5 m 35.8s). Draconic month is important for predicting → eclipses. Also called draconitic month, nodical month.

Draconic, adj. of dragon, → Draco, referring to a mythological dragon for the following reason. Since an eclipse occurs when the Earth, the Sun, and a node are aligned and moreover the Moon is situated near the node, it was believed that a dragon that resided in the node swallowed the Sun or the Moon. → month.

Mâh, → month.
Gowzahri, related to gowzahr, from Mid.Pers. gowzihr "a node of the lunar orbit" [gowzihr sar ("head") = ascending node, gowzihr dumb ("tail") = descending node], also the astrological dragon, from Av. gao-ciθra- "keeping in it the seed of the ox," epithet of the Moon, since according to Iranian mythology the Moon keeps the seed/sperm of bovine animals; from gao- "cow, ox, bull" (Mod.Pers. gâv, Skt. gaus-, Gk. bous "ox," Arm. kov, O.E. cu, PIE *gwou-) + ciθra- "origin, seed, lineage" (Mod.Pers. cehr "origin"). Gowzahr was loaned into Arabic astronomical texts as jawzahr.
Gerehi, adj. of gerehnode.

Draconids
  اژدهاییان   
eždahâiyân

Fr.: Draconides   

Two meteor showers with radiants in the constellation → Draco. One appears early in October and the other late in June.

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

Eždahâyiyân, from eždahâ, → Draco, + -iyân-ids.

drag
  ۱) کره، ۲) وارانه؛ ۳) کریدن، کراندن   
1) kerré, 2) vârâné; 3) kerridan, kerrandan

Fr.: 1) traînée, entraînement; 2) traînée; 3) traîner   

1) General: The act of dragging or the state of being dragged.
2) Fluid mechanics: The → force that opposes the relative motion of an object through a → fluid. In → aeronautics, the component of aerodynamic force parallel to the relative wind tending to reduce the forward motion of the airplane. See also → lift; → thrust.
3) To pull or be pulled with force, especially along the ground or other surface.

From O.N. draga, O.E. dragan "to draw," from P.Gmc. *dragan "to draw, pull," from PIE base *dhragh- "to draw, drag on the ground" (cf. Skt. dhrajati "pulls, slides in," L. trahere "to pull," Rus. drogi "wagon."

Kerr, kerré, kerridan "drag," cf. Laki keronen, Hamadâni kerândan "to pull along, drag," Tâleši kernye, Tabari kərəš "to drag;" Lori, Hamadâni kerr "line, scratch;" related to Mid/Mod.Pers. kešidan, kašidan "to draw, protract, trail, drag, carry;" kâštan, keštan, kâridan "to cultivate, to plant, to make furrows;" Av. kar- "to strew seed, cultivate," kāraiieiti "cultivates," karš- "to draw (a furrow), till, plant;" cf. Skt. kar- "to scatter, strew, pour out," kars-, kársati "to pull, drag, plow;" Gk. pelo, pelomai "to move, to bustle;" PIE base kwels- "to plow."
Vârâné, from vâ-, opposition prefix, → de-, + râné, from rândan "to push, drive, cause to go" (causative of raftan "to go, walk, proceed," present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").

Draine field
  میدان ِ درین   
meydân-e Draine

Fr.: champ de Draine   

A unit used to express the strength of → far ultraviolet (FUV) average → interstellar radiation field. It is equal to ~ 1.7 → Habing field.

Named after B. T. Draine, 1978, ApJS 36, 595.

Drake equation
  هموگش ِ دریک   
hamugeš-e Drake

Fr.: équation de Drake   

A probabilistic argument used to estimate the number of → intelligent, communicating → extraterrestrial civilizations in the → Milky Way galaxy. The Drake equation is:
N = R* . fp . ne . fl . fi . fc . L, where:
N = the number of → civilizations in our Galaxy with which → communication might be possible,
R* = the average rate of → star formation in our Galaxy,
fp = the fraction of those stars that have → planets,
ne = the average number of planets that can potentially support → life per star that has planets,
fl = the fraction of planets that could develop life at some point,
fi = the fraction of planets with life that actually go on to develop intelligent life,
fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space,
L = the length of time for which such civilizations release detectable signals into space.
The first three terms of the equation have been successfully investigated by astronomers and are to some extent known. In contrast, values for the last four are very speculative. Drake himself estimates that N might be as high as 10,000. Carl Sagan was more optimistic, and came up with the value of a million or more for N. These estimates may be too optimistic. A pessimistic choice of parameters leads to N smaller than 1, which means that we might be the only technically sophisticated civilization in the Galaxy.

Frank Donald Drake (1930-); → equation.

dredge-up
  برونکشید   
borunkašid

Fr.: dragage, remontée   

A process by which the nucleosynthesis products inside a star are drawn to upper layers of the star. → first dredge-up; → second dredge-up; → third dredge-up.

From M.E. (Scots) dreg-, O.E. draeg- (in drægnet "dragnet"), akin to dragan "to draw" + up.

Birunkašid, past stem of birun kašidan, from birun "out, the outside" (Mid.Pers. bêron, from "outside, out, away" + rôn "side, direction," Av. ravan- "(course of a) river") + kašidan "to draw," Mid.Pers. kašitan, Av. karš- "to draw," Skt. kars-, kársati "to pull, drag, plough," Gk. pelo, pelomai "to be busy, to bustle."

Dresden codex
  نبیگان ِ درسدن   
nebigân-e Dresden (#)

Fr.: codex de Dresden   

A pre-Colombian Maya manuscript consisting of numerous calendar and astronomical data, probably dating from the 12th century. It seems that it is an updated copy of a document from the period of the old Maya Empire (4th-9th centuries). It contains a table which covers over 32 years, grouping 45 successive → lunations, divided into 69 groups of 5 or 6 lunations. The data are calculated in days and correspond remarkably to the intervals in an eclipse table: each group ends at the probable date of a solar eclipse (M.S.: SDE).

Dresden refers to the Dresden Library where the original document is preserved. It was bought in 1739 by the library director, Johann Christian Götze, who found it in a private library in Vienna. Its earlier history is unknown; codex, from L. codex earlier caudex "book, book of laws," literally "tree-trunk, book (formed originally from wooden tablets);" → codex.

drift
  ۱) دلک؛ ۲) دلکیدن   
1) delek; 2) delekidan

Fr.: 1) dérive; 2) dériver   

1a) General: A driving movement or force; impulse; impetus; pressure.
1b) Physics: A slight change of a quantity with time, for example the sensitivity of an electronic detector continuously operated during a long period as an effect of continued use.
1c) A slow change in frequency of a radio transmitter.
1d) Aerospace: The gradual deviation of a rocket or guided missile from its intended trajectory.
2) (v.intr.) To be carried along by currents of water or air, or by the force of circumstances.

From M.E. drift, from O.E. drifan "to drive," or from O.N. or M.Du. drift, from P.Gmc. *driftiz, related to *dribanan "to drive."

Delek from Lori, Laki, Hamadâni, Malâyeri "push, shove, drive;" variants Gilaki duko, Tâleši dako, Baluchi dhakkk(a) "push, shove, blow," Choresmian dh- "to hit," Kurd. dân/di- "to beat, hit," Proto-Iranian *daH- "to beat, hit, strike" (Cheung 2007); PIE base *dhen- "to hit, push;" delekidan, verb from delek.

drift curve
  خم ِ دلک   
xam-e delek

Fr.: courbe de passage   

In radio astronomy, the output response as a function of position for a given filter as the source passes through the beam.

drift; → curve.

drift rate
  نرخ ِ دلک   
nerx-e delek

Fr.: taux de dérive   

The amount of drift, in any of its several senses, per unit time.

drift; → rate.

drift velocity
  تندای ِ دلک   
tond-ye delek

Fr.: vitesse de dérive   

The average velocity of a charged particle in a plasma in response to an applied electric field.

drift; → velocity.

drive
  ۱) راندن؛ ۲) رانش، رانه   
1) rândan (#); 2) râneš (#), râné (#)

Fr.: 1) entraîner; 2) entraînement   

1a) To cause to move, to force to act. → continuum-driven wind, → dust-driven wind, → line-driven wind, → radiation-driven implosion, → radiation-driven mass loss, → radiation-driven wind.
1b) To cause and → guide the → motion of a → telescope.
2a) The act of driving.
2b) The → mechanism that imparts or transfers → power to a telescope so that it can move. → alpha drive, → delta drive, → drive accuracy, → slewing drive .

M.E. driven; O.E. drifan; cf. O.N. drifa, Goth. dreiban.

Rândan "to cause to go," causative of raftan "to go, walk, proceed" (present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").

drive accuracy
  رشمندی ِ رانه   
rašmandi-ye râné

Fr.: précision de guidage   

The accuracy with which a telescope is moved by alpha or delta drives.

drive; → accuracy.

drizzle
  نرمه باران   
narmé bârân (#)

Fr.: bruine, crachin   

Very small, numerous, and uniformly distributed water drops that may appear to float while following air currents. Unlike fog droplets, drizzle falls to the ground.

Drizzle, dryseling "a falling of dew," from M.E. drysning, related to dreosan "to fall," cf. O.S. driosan, Goth. driusan.

Narmé bârân literally "smooth rain," from narmé, from narm "soft; smooth; mild," Mid.Pers. narm + bârân, → rain.

drop
  ۱) چکه؛ ۲) چکیدن   
1) cekké; 2) cekidan

Fr.: 1) goutte; 2) tomber goutte à goutte   

1a) A small quantity of liquid that falls or forms in a round or pear-shaped mass.
1b) A very small quantity of liquid; a very small quantity of anything.
2) To fall in small portions, as water or other liquid.

M.E. drop(e), from O.E. dropian; related to O.H.G. triofan, Du. drop, Ger. Tropfen.

Cekké, cekidan "drop; small, minute," cekidan "to drop."

droplet
  چکه، چکک   
cekké, cekkak

Fr.: gouttelette   

A very small drop of a liquid.

drop + diminutive suffix let.

Drummond light
  نور ِ درامن   
nur-e Drummond

Fr.: lumière de Drummond   

A very brilliant white light which is the ignited flame of a mixture of oxygen and hydrogen projected against a block of calcium oxide (lime). Also called limelight. First working version produced by Lieutenant of the Royal Engineers, upon the Ordnance Trigonometrical Survey of Ireland (1826). It was used at night as a substitute for solar light. It was first employed in a theater in 1837 and was in wide use by the 1860s, among which in photography.

Named after Scottish engineer Thomas Drummond (1797-1840); → light.

dry
  خشک   
xošk (#)

Fr.: sec, aride   

1) Lacking moisture; not damp or wet.
2) Having little or no rainfall.

M.E. drie; O.E. dryge; cf. M.L.G. dröge, M.Du. druge, Du. droog, O.H.G. trucchon, Ger. trocken.

Xošk "dry;" Mid.Pers. xušk "dry;" O.Pers. uška- "mainland;" Av. huška- "dry;" cf. Skt. śuska- "dry, dried out;" Gk. auos "dry, dried up;" O.E. sēar "dried up, withered;" Lith. sausas "dry, barren."

dry merger
  تشک ِ بی‌گاز   
tašk-e bigâz

Fr.: fusion sans gaz   

A merger between → gas-poor  → early-type galaxies.

dry; → merger.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag 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 mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg 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 > >>