An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 611
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.

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.


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").


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.

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").


Fr.: implication   

1) General: Something implied; the act of implying.
2) A statement that follows from other given statements. For ex., an implication of x = -1 is that x2 = 1.
3) A proposition found from two given propositions by connecting them in the form "If ..., then ...". The first statement is the antecedent (or hypothesis) and the second the consequent (or conclusion).

From L. implicationem "interweaving, entanglement," from implicatus, p.p. of implicare "involve, entangle, connect closely," from → in- "in" + plicare "to fold," → explain.

Dartâheš, verbal noun of dartâhidan "to imply," from dar-, → in- + tâhidan "to fold, ply," → explain.


Fr.: implicite   

1) General: Implied, rather than expressly stated.
2) Math.: → implicit function.

From L. implicitus, variant of implicatus, p.p. of implicare, → implication.

Dartâhi, from dartâh present stem of dartâhidan, → implication, + -y adj. suffix.

implicit function
  کریای ِ درتاهی   
karyâ-ye dartâhi

Fr.: fonction implicite   

A function which contains two or more variables that are not independent of each other. An implicit function of x and y is one of the form f(x,y) = 0, e.g., 4x + y2 - 9 = 0. See also → explicit function.

implicit; → function.

  فروکفتن، فروکفتیدن   
forukaftan, forukaftidan

Fr.: imploser   

To collapse, or cause to → collapse, inward → violently. Opposite of → explode.

Implode, from → in- + (ex)plode, from L. plaudere "to clap, beat," of uncertain origin.

Forukaftidan, from foru- "down, downward; below; beneath" (Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain") + kaftidan "to burst; to split," variants kaftan, kâftan "to split; to dig," (Parthian Mid.Pers. q'f- "to split;" Sogdian "to spli;" Chorasmian kf- "to split, be split;" Proto-Iranian *kap-, *kaf- "to split").


Fr.: implosion   

A violent inward collapse; the act of imploding; opposed to → explosion.

Verbal noun of → implode.


Fr.: impliquer   

1) To involve or indicate by inference, association, or necessary consequence rather than by direct statement .
2) To contain potentially.
3) To express indirectly (

Infinitive of → implication.

  دربرتیدن، دربرت   
1) darbartidan; 2) darbart

Fr.: import   

1a) To bring in (merchandise, commodities, workers, etc.) from a foreign country for use, sale, processing, reexport, or services.
1b) Computers: To bring (documents, data, etc.) into one software program from another.
2) The act of importing or bringing; something that is imported (

From im-, variant of → in- + port, → export.


Fr.: important   

Of great significance or effect.

From M.Fr. important, from M.L. importantem, from importare "be significant in," from importare "bring in," → in- "into, in" + portare "to carry."

Garin, on the model of Kurd. giring "important," related to girân, gerân "heavy, important;" Mid.Pers. garân, Proto-Ir. stem *garu-; cf. Av. gouru-; Skt. guru- "heavy, important, venerable;" L. gravis "weighty, serious, heavy," → gravity.


Fr.: imposer   

1) To lay on or set as something to be borne, endured, obeyed, fulfilled, paid, etc.
2) To put or set by or as if by authority (

M.E., from O.Fr. imposer "put, place; impute, charge, accuse," from → in- "into, in" + poser "put, place," → position.

Barnehâdan, literally "to place on, upon," from bar-, → on-, + nehâdan "to put, place," → compose.

  برنها، برنهنده، برنهان   
barnehâ, barnehandé, barnehân

Fr.: imposant   

Very impressive because of great size, stately appearance, dignity, elegance, etc. (

impose; → -ing.


Fr.: imposition   

1) The laying on of something as a burden or obligation.
2) Something imposed, as a burden or duty; an unusual or extraordinarily burdensome requirement or task.
3) The act of imposing by or as if by authority (

impose; → -tion.

nâšodani (#)

Fr.: impossible   

Not possible; unable to be, exist, happen. Unable to be done, performed, effected.

in-; → possible.

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