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: 699
define
  هداریدن   
hedâridan

Fr.: définir   

1) To state or set forth the meaning of (a word, concept, etc.).
2) To explain or identify the nature or essential qualities of.
3) To fix or mark the boundaries or extent of.

From O.Fr. définir "to end, determine," from L. definire "to limit, determine, explain," from → de- + finire "to bound, limit," from finis "boundary."

Hedâridan, infinitive from Semnâni hedâr "boundary (between pieces of lands)," Tabari hedâri "boundary, border," may be related to Av. haêtav- "dam, dike," Skt. setu- "a ridge of earth, bank, dike, dam, bridge."

defined
  هداریده   
hedâridé

Fr.: défini   

1) Clearly characterized or fixed.
2) Showing clearly the outline or profile or boundary.
3) Computer science: A variable having received a value prior to a given point in a program.

P.p. of → define.

definite
  هدارمند   
hedârmand

Fr.: défini   

Clearly defined or determined; having fixed limits. → definite integral.

From L. definitus "limited, precise," p.p. of definire, → define.

Hedârmand from hedâr, stem of hedârdan, → define, + -mand possession suffix.

definite integral
  درستال ِ هدارمند   
dorostâl-e hedârmand

Fr.: intégrale définie   

An integral with upper and lower limits.

definite; → integral.

definition
  هدارش   
hedâreš

Fr.: définition   

1) The act or process of establishing some value or condition with precision.
2) The formal statement of the meaning or significance of a word, concept, etc.
3) Optics: The clarity, fidelity, sharpness, and brilliancy of an image formed by an optical system.

Verbal noun of → define.

definitive
  هدارا   
hedârâ

Fr.: définitif   

Most reliable or complete (as of a text, author, criticism, study, judgement, or the like) that serves as a standard or reference point.

M.E., from O.Fr., from L. definitivus, from definit(us)definite + -ivus a suffix of adjectives.

Hedârâ, adj., from hedâr present stem of hedâridandefine + adj. suffix .

deflagrate
  تشکفتیدن   
taškaftidan

Fr.: faire une déflagration, s'enflammer   

To burn suddenly and violently with great heat and intense light. → deflagration.

From L. deflagratus, p.p. of deflagrare "to burn down," from → de- + flag(rare) "to blaze, glow, burn" (L. fulgur "lightning;" PIE *bhleg- "to shine;" cf. Gk. phlegein "to burn, scorch," Skt. bhárgas- "radiance, lustre, splendour," O.E. blæc "black") + -atus "-ate"

Taškaftidan, from taš "fire," variant of âtašfire + kaftidan "to explode," → explode.

deflagration
  تشکفت   
taškaft

Fr.: déflagration   

A rapid → chemical reaction in which the → output of → heat is enough to enable the reaction to proceed and be accelerated without input of heat from another source. The effect of a true deflagration under confinement is an → explosion. See also: → detonation; → explosion.

Verbal noun of → deflagrate.

deflect
  واچفتیدن، واچفتن   
vâcaftidan, vâcaftan

Fr.: défléchir   

To bend or turn aside; turn from a true course or straight line.

From L. deflectere "to bend down, turn aside," from → de- "away" + flectere "to bend, turn."

Vâcaftidan, vâcaftan, from vâcaft, from vâ- "away," → de- + caft "bent, curved, crooked," variants cafté, jafté, jaftâ.

deflection
  واچفت   
vâcaft

Fr.: déflexion   

The act or state of deflecting or the state of being deflected. Amount of deviation.
Electronics: In a cathode-ray tube, the bending, by a magnetic field, of the beam of electrons after the focused beam leaves the electron gun.

Verbal noun of → deflect.

deflection angle
  زاویه‌ی ِ واچفت   
zâviye-ye vâcaft

Fr.: angle de déflexion   

1) The angle by which a light ray is curved by the gravitational field of a massive body. Einstein's general relativity predicts that a light ray which tangentially grazes the surface of the Sun is deflected by 1''.7. This result was confirmed in 1919 when the apparent angular shift of stars close to the limb of the Sun was measured during a total solar eclipse.
2) In a cathode-ray tube, the angle through which the beam is bent, vertically, horizontally, or diagonally.

deflection; → angle.

deflection of light
  واچفت ِ نور   
vâcaft-e nur

Fr.: déflexion de la lumière   

The bending of a light ray under the gravitational effect of a massive body. → deflection angle.

deflection; → light.

defocus
  واکانونیدن   
vâkânunidan

Fr.: défocaliser   

To cause to deviate from accurate focus.

vâ- + → focus.

deform
  ۱) وادیسیدن؛ ۲) وادیساندن   
1) vâdisidan; 2) vâdisândan

Fr.: 1) se déformer; 2) déformer   

1) To undergo → deformation.
2) To change the form or shape of. → deformable, → deformed, → deformation.

From O.Fr. déformer, from L. deformare "to disfigure," from → de- + → form.

Vâdisidan, vâdisândan infinitive from vâdis, from vâ-, → de-, + dis, → form.

deformable
  وادیسیدنی   
vâdisidani

Fr.: déformable   

Capable of being → deformed. → deformable mirror

deform + → -able.

deformable mirror
  آینه‌ی ِ وادیسیدنی   
âyene-ye vâdisidani

Fr.: miroir déformable   

A very thin mirror whose shape can be changed by the force applied by many small pistons behind the mirror. Such a mirror is used in the → adaptive optics technique to correct the → wavefront affected by the → atmospheric turbulence. See also → tip-tilt mirror.

deformable; → mirror.

deformation
  وادیس، وادیسش، وادیسانش   
vâdis, vâdiseš, vâdisâneš

Fr.: déformation   

Altering in the size or shape of a body. See also → deformable.

Verbal noun of → deform.

deformed
  وادیسیده   
vâdisidé

Fr.: déformé   

Having the → form → changed.

Past participle of → deform.

defunct
  ناکار   
nâkâr

Fr.: défunt   

1) No longer in effect or use; not operating or functioning.
2) No longer in existence; dead; extinct.

M.E., from O.Fr. defunct or directly from L defunctus "dead," literally "off-duty," from p.p. of defungi "to discharge, finish," from → de- "off, completely" + fungi "perform or discharge duty," from PIE root *bheug- "to enjoy" (cognates: Latin fructus).

Nâkâr, "disabled" (Dehxodâ), leterally "not working," from negation prefix nâ-, → un-, + kâr, kardan, → work

defunct comet
  دمباله‌دار ِ ناکار   
dombâledâr-e nâkâr

Fr.: comète défunte   

A comet that has lost its ability to emit dust and gas and no longer displays the classic cometary features of a nebulous coma and a tail, or a destroyed comet. Comet Pigott The asteroid (944) Hidalgo is considered by some to be a defunct comet because of its unusual orbit. Another case is the asteroid Phaethon.

defunct; → comet.

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