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: 662
imaging
  وینه‌گری، تصویرگری   
vinegari, tasvirgari (#)

Fr.: imagerie   

The visual representation of an astronomical body using a two-dimensional detector and computerized techniques.

From → image + → -ing.

Tasvirgari, from tasvirgar agent noun from tasvirimage + -gar from kar-, kardan "to do, to make" (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "makes;" cf. Skt. kr- "to do, to make;" krnoti "makes," karma "act, deed;" PIE base kwer- "to do, to make").

Imaging Atmospheric Cherenkov Technique (IACT)
  تشنیک ِ وینه‌گری ِ چرنکوف ِ جوی   
tašnik-e vinagari-ye Čerenkov-e javvi

Fr.: téchnique d'imagerie Čerenkov atmosphérique   

The method used to detect very brief flashes of → Cherenkov radiation generated by the → cascade shower of → relativistic charged particles produced when a very high-energy → gamma ray (in the range 50 GeV to 50 TeV) strikes the atmosphere at a typical altitude of 10 km. Owing to this technique, it possible to discriminate cosmic gamma rays from the cosmic ray background and to determine their energy and source direction. More specifically, the incoming gamma-ray photon undergoes → pair production in the vicinity of the nucleus of an atmospheric molecule. The electron-positron pairs produced are of extremely high energy and immediately radiate in a → bremsstrahlung process. This radiation is itself extremely energetic, with many of the photons undergoing further pair production. A cascade of charged particles ensues which, due to its extreme energy, produces a flash of Cherenkov radiation lasting between 5 and 20 nano-seconds. The total area on the ground illuminated by this flash corresponds to many hundreds of square meters, which is why the effective area of IACT telescopes should be large.

imaging; → atmospheric; → Cherenkov; → technique.

imaging detector
  آشکارگر ِ وینه‌گری، ~ تصویرگری   
âškârgar-e vinegari, ~ tasvirgari

Fr.: détecteur d'image   

A detector with two-dimensional capability, such as a CCD.

image; → → scale.

immediate
  ۱) آنی، امدیم؛ ۲) امدیم   
1) âni, amadim; 2) amadim

Fr.: immédiat   

1) Occurring or accomplished without delay; following or preceding without a lapse of time. → instant.
2) Having no object or space → intervening; without intervening medium or agent; direct (Dictionary.com).

M.E. immediat, from O.Fr. immediat, from L.L. immediatus "without anything between," from → in- "not, opposite of," + mediatus, p.p. of mediare "to be in the middle," from L. medius "middle," → medium.

Âni, from ân loan from Ar. ân "time, a short time."
Amadim, literally "with nothing interposed," from the negation prefix → a- + madium, → medium.

immerge
  درمرچیدن   
darmarcidan

Fr.: immerger   

To plunge into or place under a liquid; dip; sink (Dictionary.com).

in- + merge, → submerge.

immersion
  درمرچ   
darmarc

Fr.: immersion   

The disappearance of a star, planet, moon, or other body at the beginning of an → occultation or → eclipse. Also called → ingress.

immerge.

immigrate
  درموژیدن   
darmužidan

Fr.: émigrer   

To come to a country of which one is not a native, usually for permanent residence.

in-; → migrate.

impact
  برخورد   
barxord (#)

Fr.: impact, collision   

A collision between two bodies. In the case of solar system objects, when one is much smaller than the other (like a meteoroid colliding with the Earth), a crater may be produced on the larger body.

From L. impactus, p.p. of impingere "to drive into, strike against," from → in- "in" + pangere "to fix, fasten."

Barxord, verbal noun of barxordan "to collide, clash, dash against each other," from bar- "on, upon, up" (Mid.Pers. abar; O.Pers. upariy "above; over, upon, according to;" Av. upairi "above, over," upairi.zəma- "located above the earth;" cf. Gk. hyper- "over, above;" L. super-; O.H.G. ubir "over;" PIE base *uper "over") + xordan "to hit, strike," originally "to eat, drink, devour," and by extension "to destroy," from Mid.Pers. xvardan "to eat, enjoy (food)," Av. xvar- "to consume, eat;" Laki dialect hovârden "to eat;" Proto-Iranian *huar- "to consume, eat."

impact crater
  لاوک ِ برخورد   
lâvak-e barxord

Fr.: cratère d'impact   

A depression produced by the collision of a meteorite, asteroid, or comet with the surface of a planet or a satellite. Impact craters are the most characteristic surface features of solar system rigid bodies. They range in size up to hundreds or thousands of kilometers (where the impacts create giant basins as on the Moon, Mars, and Mercury).

impact; → crater.

impact erosion
  فرسایش ِ برخوردی   
farsâyeš-e barxordi

Fr.: érosion par impact   

An → atmospheric escape mechanism that occurs where atmospheric gases are expelled en masse as a result of large body impacts, such as the cumulative effect of asteroids hits (see, e.g., Catling, D. C. and Kasting, J. F., 2017, Escape of Atmospheres to Space, pp. 129-167. Cambridge University Press).

impact; → erosion.

impact event
  رویداد ِ برخورد   
ruydâd-e barxord

Fr.: impact cosmique   

A collision between two celestial objects, specially solar system bodies, with considerable consequences. Impact events involve release of large amounts of energy. Some examples are the 1908 Siberian → Tunguska event by a → comet, the → Barringer Crater, and the collision of an → asteroid with Earth 65 million years ago, which is thought to have led to the extinction of the dinosaurs and other species of the → Cretaceous-Paleogene period.

impact; → event.

impact hazard
  آپه‌ی ِ برخورد   
âpe-ye barxord

Fr.: risque d'impact   

The danger of collision with Earth posed by solar system small bodies that pass near our planet. These objects include → near-Earth asteroids and nuclei of → comets. See also: → near-Earth object, → impact crater, → Torino scale, → Palermo scale, → Space Situational Awareness.

impact; → hazard.

impact ionization
  یونش ِ برخوردی   
yoneš-e barxordi

Fr.: ionisation par collision   

The loss of orbital electrons by an atom of a crystal lattice which has undergone a high-energy collision.

impact; → ionization.

impact parameter
  پارامون ِ برخورد   
pârâmun-e barxord

Fr.: paramètre d'impact   

1) A measure of the distance by which a collision fails being frontal.
2) In → gravitational lensing, the distance of closest approach of the light path to the → lensing object.
3) In → rainbows, the displacement of the → incident from an axis that passes through the center of the water droplet.

impact; → parameter

impact winter
  زمستان ِ برخورد   
zemestân-e barxord

Fr.: hiver par impact   

The enormous drop in temperature and the related effects of the shrouding of Earth with soot and dust particles after the planet is struck by a sizable comet or asteroid. Such a phenomenon is believed to have killed off the dinosaurs 65 million years ago.

impact; → winter.

impactite
     
impaktit, barxordit

Fr.: impactite   

A general term used for all rocks affected by, or produced by, the → shock waves and other processes generated by hypervelocity → meteorite → impact events. Impactites occur in and around the → impact crater, typically as individual bodies composed of mixtures of melt and rock fragments, often with traces of meteoritic material.

impact; → -ite.

impactor
  برخوردگر   
barxordgar

Fr.: impacteur   

A natural impacting body, such as a comet, asteroid, or planet. It can also be a space probe designed to collide with an astronomical body in the solar system.

Impactor, from → impact + -or a suffix forming agent nouns.

Barxordgar, from barxord, → impact, + -gar agent suffix, from kar-, kardan "to do, to make" (Mid.Pers. kardan, O.Pers./Av. kar- "to do, make, build," Av. kərənaoiti "makes," cf. Skt. kr- "to do, to make," krnoti "makes," karma "act, deed;" PIE base kwer- "to do, to make").

impart
  درپاردن   
darpârdan

Fr.: donner, transmettre, communiquer   

1) To give, convey, or grant from or as if from a store.
2) To communicate the knowledge of; disclose.

M.E., from O.Fr. impartir, from L.L. impartire "to share in, divide with another, communicate," from assimilated form of → in- "into, in" + partire "to divide, → part."

Darpârdan, from dar-, → in-, + pâr, → part, Mid.Pers. pârag "part, portion; gift, offering;" Av. pāra- "debt," from par- "to remunerate, equalize; to condemn;" PIE *per- "to sell, hand over, distribute; to assign;" + -dan infinitive suffix.

impedance
  پاگیری   
pâgiri (#)

Fr.: impédance   

General: The ratio of a quantity with the nature of a force to a related quantity with the nature of a current.
Electricity: The apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective current

From impede, from L. impedire "to entangle," literally "to shackle the feet," from in- "in" + pes (gen. pedis) "foot" + -ance a suffix used to form nouns either from adjectives in -ant or from verbs.

Pâgiri, verbal noun of pâgir "impedder, impeded; hinderer, hindered," from "foot, step" (from Mid.Pers. pâd, pây; Av. pad- "foot;" cf. Skt. pat; Gk. pos, gen. podos; L. pes, gen. pedis; P.Gmc. *fot; E. foot; Ger. Fuss; Fr. pied; PIE *pod-/*ped-) + gir present stem of gereftan "to take, seize" (Mid.Pers. griftan, Av./O.Pers. grab- "to take, seize," cf. Skt. grah-, grabh- "to seize, take," graha "seizing, holding, perceiving," M.L.G. grabben "to grab," from P.Gmc. *grab, E. grab "to take or grasp suddenly;" PIE base *ghrebh- "to seize").

imperare (L.)
  پرماتیدن   
parmâtidan

Fr.: inperare (L.)   

Latin verb meaning "to command, rule, reign."

L. imperare "to command, give orders, exercise authority," from → in- "into, in" + parare "to make ready, supply, order," related to parire "produce, give birth to," from PIE root *pere- "to produce, procure;" cf. Skt. prthukah "child, calf, young of an animal;" Gk. poris "calf, bull;" Czech spratek "brat, premature calf;" Lith. periu, pereti "to brood;" O.H.G. farro, Ger. Farre, Du. varre "bull," O.E. fearr "bull;" see below for possible Iranian cognates.

Parmâtidan, from BMP plm'(d)y "to command, order," Sogd. framat- "to command," variants of farmudan, farmâyidan "to command, to order," ultimately from prefixed Proto-Ir. *fra-maH-, from *maH- "to measure," → experiment.

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