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: 10 Search : jet
astrophysical jet
  شان ِ اخترفیزیکی   
šân-e axtarfiziki

Fr.: jet astrophysique   

A very fast moving, → collimated beam of → ionized gas at high temperatures associated with → protostars, → X-ray binary systems, and, at a larger scale, with → active galactic nuclei.

astrophysical; → jet.

bipolar jet
  شان ِ دوقطبی   
šân-e doqotbi

Fr.: jet bipolaire   

One of two beams of high-temperature, ionized gas ejected in two opposite directions associated with a → protostar. The collimated jets, a consequence of the → accretion process, can extend over distances of several → light-years.

bipolar; → jet.

blue jet
  شان ِ آبی   
šân-e âbi

Fr.: jet bleu   

A transient optical phenomenon in the → stratosphere that emerges from the tops of → thunderstorm clouds at tremendous speeds. As their name implies, blue jets are optical ejections from the top of the electrically active core regions of thunderstorms. Following their emergence, they typically propagate upward in narrow cones at vertical speeds of roughly 100 km/s, fanning out and disappearing at heights of about 40-50 km. See also → sprite; → elve.

blue; → jet.

jet
  ۱، ۲، ۳) اِشان، شان؛ ۴) جت   
1, 2, 3) ešân, šân; 4) jet

Fr.: jet   

1) A stream of a liquid, gas, or small solid particles forcefully shooting forth from a nozzle, orifice, etc.
2) Fountain-like formations of gas and/or dust gushing out from compact regions of some astronomical objects. → astrophysical jets.
3) Meteo.: A common abbreviation for → jet stream.
4) Shortened of → jet plane.

Jet, from M.Fr. jeter "to throw," from V.L. *jectare, alter. of L. jactare, from jac- "throw" + -t- frequentative suffix + -are infinitive suffix; PIE base *ye- "to do" (cf. Gk. hienai "to send, throw;" Hittite ijami "I make").

Ešân, from ešândan, → eject; šân contraction of ešân.

jet engine
  موتور ِ شانی   
motor-e šâni

Fr.: turboréacteur   

An → engine that works by taking in air at the front and expelling exhaust gases at the rear so that the reaction to this exhaust propels the vehicle forward.

jet; → engine.

jet plane
  جت، هواپیما‌ی ِ ~   
jet (#), havâpeymâ-ye ~ (#)

Fr.: avion à réaction   

An airplane moved by → jet propulsion.

jet; plane, short for airplane, from Fr. aeroplane, from aero-, → air, + plane feminine of plan "flat, level," from L. planus, perhaps by association with forme plane; apparently coined and first used by Fr. sculptor and inventor Joseph Pline in 1855.

jet; havâpeymâ "airplane," from havâ, → air, + peymâ "travelling; traveller," from peymudan, peymâyidan "to travel, traverse, pass over," from Mid.Pers. patmudan, paymudan "to measure (against)," from *pati-māya-. The first element *pati- "against, back" (cf. Mod.Pers. pâd- "against, contrary to;" Mid.Pers. pât-; O.Pers. paity "agaist, back, opposite to, toward, face to face, in front of;" Av. paiti; Skt. práti "toward, against, again, back, in return, opposite;" Pali pati-; Gk. proti, pros "face to face with, toward, in addition to, near;" PIE *proti). The second element from *mā- "to measure;" O.Pers./Av. mā(y)- "to measure;" cf. Skt. mati "measures," matra- "measure;" Gk. metron "measure;" L. metrum; PIE base *me- "to measure." Apart from peymâ, several other terms in Mod.Pers. are related to this second element, which occurs also as mun, mân, man, mâ, mu, and mây: pirâmun "perimeter," âzmun, âzmây- "test, trial," peymân "measuring, agreement," peymâné "a measure; a cup, bowl," man "a measure weighing forty seers)," nemudan, ne- "to show, display," âdan, âmây- "to prepare."

jet propulsion
  پیشرانش ِ شانی   
pišrâneš-e šâni

Fr.: propulsion par réaction   

Powerful, forward thrust that results from the rearward expulsion of a jet of fluid, especially propulsion by jet engines.

jet; → propulsion.

jet stream
  رابه‌ی ِ شانی   
râbe-ye šâni

Fr.: jet stream   

Meteo.: An area of relatively strong winds that are concentrated in a narrow band in the upper troposphere of the middle latitudes and subtropical regions of the Northern and Southern Hemispheres.

jet; → stream.

optical jet
  شان ِ نوری   
šân-e nuri

Fr.: jet optique   

An → astrophysical jet which is visible in the optical range of the electromagnetic radiation.

optical; → jet.

radio jet
  رادیو-شان، شان ِ رادیویی   
radio-šân, šân-e râdioyi

Fr.: jet radio   

An → astrophysical jet appearing in the radio wavelengths of the electromagnetic spectrum.

radio; → jet.