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: 12948 Search : far
diphthong
  دوواکه   
dovâké

Fr.: diphthongue   

Phonetics: A → vowel sound produced by a blended sequence of two separate vowels in a single syllable, where the sound begins as one vowel and moves toward another (as in loud, light, and lair).

From M.Fr. diphthongue, from L.L. diphthongus, from Gk. diphthongos "having two sounds," from → di- "double" + phthongos "sound, voice."

Dovâké, from do "two, → di-" + vâké, vâk, → voice.

diplopia
  دوبینی   
dobini (#)

Fr.: diplopie   

A pathological condition of vision in which a single object appears double because the eyes are not focusing properly. Same as → double vision.

From L. diplo- "double, in pairs," from Gk., combining form of diplos "twofold" + -opia, from Gk. -opia, from ops "eye."

Dobini, from dotwo + bini "vision, seeing," from bin "to see; seer" (present stem of didan; Mid.Pers. wyn-; O.Pers. vain- "to see;" Av. vaēn- "to see;" Skt. veda "I know;" Gk. oida "I know," idein "to see;" L. videre "to see;" PIE base *weid- "to know, to see").

dipolar
  دیپلی، دی‌قطبی   
dipoli, diqotbi

Fr.: dipolaire   

Of or relating to a → dipole.

dipole; → -ar.

dipolar magnetic field
  میدان ِ مغناتیسی ِ دیپلی، ~ ~ دی‌قطبی   
meydân-e meqnâtisi-ye dipoli, ~ ~ diqotbi

Fr.: champ magnétique dipolaire   

A → magnetic field produced by a system possessing a net magnetic → dipole moment.

dipolar; → magnetic; → field.

dipole
  دیپل، دی‌قطبه   
dipol, diqotbé

Fr.: dipole   

1) A combination of two electrically or magnetically charged particles of opposite signs, which are separated by a very small distance.
2) Chemistry: A molecule containing both positively and negatively charged groups.

di- "two, twice, double," + → pole.

dipole anisotropy
  ناهمسانگردی ِ دی‌پل، ~ دی‌قطبه   
nâhamsângardi-ye dipol, ~ diqotbé

Fr.: anisotropie dipolaire   

A form of anistropy in the temperature of the → cosmic microwave background radiation, appearing as one hot pole and one cold pole, caused by our motion with respect to the cosmic background radiation. The temperature variations, amounting to 1 part in 1000, yield a velocity of about 600 km/sec for our Galaxy with respect to the background. → cosmic microwave background anisotropy.

dipole; → anisotropy.

dipole antenna
  آنتن ِ دیپل، ~ دی‌قطبه   
ânten-e dipol, ~ diqotbé

Fr.: antenne dipôle   

One of the simplest kinds of antenna which is connected at the center to a radio-frequency feed line for transmitting or receiving radio frequency energy. It differs from the dish antenna in that it consists of many separate antennas that collect energy by feeding all their weak individual signals into one common receiving set.

dipole; → antenna.

dipole moment
  گشتاور ِ دوقطبه   
gaštâvar-e doqotbé (#)

Fr.: moment dipolaire   

1) The product of the strength of either of the charges in an → electric dipole and the distance separating the two charges. It is expressed in → coulomb meters. Dipole moment is a → vector quantity. Its direction is defined as toward the positive charge. In chemistry dipole moment is a quantitative measure of polarity in a molecule; the unit is the → debye.
2) The product of the strength of either of the poles in a → magnetic dipole and the distance separating the two poles. Dipole moment is a vector quantity. Its direction is defined as toward the magnetic north pole.

dipole; → moment.

dipole radiation
  تابش ِ دوقطبه   
tâbeš-e doqotbé

Fr.: rayonnement dipolaire   

The electromagnetic radiation produced by an oscillating → electric dipole or → magnetic dipole.

dipole; → radiation.

diproton
  دیپروتون   
diproton

Fr.: diproton   

An → isotope of → helium that consists of two → protons, without any → neutrons. It is extremely → unstable.

di-; → proton.

Dirac
  دیراک   
Dirac

Fr.: Dirac   

Paul A. M. Dirac (1902-1984), English theoretical → physicist, one of the founders of → quantum mechanics and → quantum electrodynamics, Nobel Prize for Physics in 1933. → Dirac annihilation, → Dirac equation, → Dirac function, → Dirac constant, → Fermi-Dirac statistics .

Dirac annihilation
  نابودی ِ دیراک   
nâbudi-ye Dirac

Fr.: annihilation de Dirac   

Same as → pair annihilation.

Dirac; → annihilation.

Dirac constant
  پایای ِ دیراک   
pâyâ-ye Dirac

Fr.: constante de Dirac   

The → Planck constant divided by 2π and denoted ħ, pronounced h-bar. Also called → reduced Planck constant.

Dirac; → constant.

Dirac equation
  هموگش ِ دیراک   
hamugeš-e Dirâk

Fr.: équation de Dirac   

The equation that describes the behavior of an → electron in a way that combines the requirements of → quantum mechanics with the requirements of → special relativity. The Dirac equation predicted the existence of antimatter

Dirac; → equation.

Dirac function
  کریای ِ دیراک   
karyâ-ye Dirâk

Fr.: fonction de Dirac   

A function of x defined as being zero for all values of x other than x = x0 and having the definite integral from x = -∞ to x = +∞ equal to unity.

Dirac; → function

Dirac's constant
  پایای ِ دیراک   
pâyâ-ye Dirac

Fr.: constante de Dirac   

Dirac constant.

Dirac; → constant.

direct
  ۱) راست، سرراست؛ ۲) راشتیدن   
1) râst (#), sarrâst (#); 2) râštidan

Fr.: 1) direct; 2) diriger   

1a) Proceeding in a straight course or line without deviation or interruption.
1b) Math.: Varying in the same manner as another quantity, especially increasing if another quantity increases or decreasing if it decreases.
1c) Astro.: Designating west-to-east motion of a planet in the same direction as the Sun's movement against the stars.
2) To administer; manage; supervise; to serve as a director in the performance or production of.

From L. directus "straight," p.p. of dirigere "set straight," from → dis- "apart" + regere "to guide;" cognate with Pers. râst, as explained below.

Râst "right, straight" (râšt in afrâštan); Mid.Pers. râst; O.Pers. rāsta- "straight, true," rās- "to be right, straight, true," rād- "to prepare;" Av. rāz- "to direct, put in line, set," razišta- "straightest, most correct," erezu- "correct, straight," rāzayeiti "directs," razan- "order;" Skt. raj- "to direct, stretch," rjuyant- "walking straight;" Gk. orektos "stretched out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" Ger. recht; E. right; PIE base *reg- "right, just; to move in a straight line."
Sarrâst, from sar here an intensive element meaning "side," originally "head" (Mid.Pers. sar; Av. sarah- "head;" Skt. siras- "head;" Gk. kara "head," keras "horn;" Mod.Pers. sarun "horn;" L. cerebrum "brain;" PIE *ker- "head, horn") + râst, as above.
Râštidan, infinitive from râšt, variant râst "direct."

direct correlation
  هم‌باز‌آنش ِ سرراست   
hambâzâneš-e sarrâst

Fr.: corrélation directe   

A correlation between two variables such that as one variable becomes large, the other also becomes large, and vice versa. The correlation coefficient is between 0 and +1. Also called positive correlation.

direct; → correlation.

direct current (DC)
  جریان ِ سرراست   
jarayân-e sarrâst

Fr.: courant continu   

An → electric current which flows in one direction only and which is substantially constant in magnitude. Virtually all electronic and computer hardware needs direct current to function. → Alternating current can be converted to direct current by means of a power supply consisting of a → transformer.

direct; → current.

direct motion
  جنبش ِ فرارو، ~ سرراست   
jonb eš-e farârow, ~ sarrâst

Fr.: mouvement direct   

The motion of a solar system body from West to East across the sky against the background stars. It is the "normal" direction of motion within the solar system. For rotating or orbiting solar system objects it is anti-clockwise as seen from above the solar system in the direction of the North Pole. The same as → prograde motion. See also → retrograde motion.

direct; → motion.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir 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 Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>