An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



<< < -ab ab- abo abs abs acc acc aco act ad add adj aeo afo agr Alf alg Alk Aln Alp alt amb ana anc ang ani ann Ant ant Ant apl apo app Apu arc arg aro asc ass ast ast ast atm ato att aur aut axi > >>

Number of Results: 954
absolute viscosity
  وشکسانی ِ اوست   
vošksâni-ye avast

Fr.: viscosité absolue   

Same as → viscosity and → dynamic viscosity.

absolute; → viscosity.

absolute zero
  صفر ِ ا َوَست   
sefr-e avast

Fr.: zéro absolu   

The → zero point of the → Kelvin scale of → temperature; the theoretical point at which all molecular activity ceases, -273.16 °C.

absolute; → zero.


Fr.: absorber   

1) General: To suck up or take up.
2) Physics: To retain → energy (radiation or sound, for example) or → matter wholly, without → reflection or → transmission.

M.Fr. absorber, from L. absorbere "to swallow up," from ab- "from" + sorbere "suck in;" PIE root *srebh- "to suck, absorb;" cf. Arm. arbi "I drank;" Gk. rhophein "to sup up, gulp down;" Lith. srebiu "to drink greedily;" Proto-Iranian *hrab- "to sip, suck (in)," cf. Pashto raw-, Shaghni râv-, Sariqoli rov-, Ishkashimi ruv- "to suck" (Cheung 2007), Pers. (prefixed) zâlu "leech."

Daršamidan, from daršam, from dar- "in, into" + šam, variant of šâm, as in âšâm, âšâmidan "to drink, to sip;" Av. šam- "to drink, sip, swallow;" Skt. cam, camati "to sip, drink, lick up, absorb."


Fr.: absorbable   

Capable of being absorbed.

Absorbable, adj. from → absorb + → -able.

Daršamidani adj. from aršamidan "to absorb" + -i, → -able.


Fr.: absorbance   

The ability of a solution or a layer of a substance to absorb → radiation, i.e. the ratio of the intensity of the light incident on the solution to the intensity transmitted by it, in logarithmic scale.

absorb; → -ance.


Fr.: absorbant   

1) Any material or → substance that → absorbs.
2) Relating to or capable of → absorption.

Absorbent, from → absorb + -ent.

Daršamandé from aršam present stem of daršamidan, → absorb, + -andé suffix forming adj. and/or agent name.


Fr.: absorbeur   

Any medium that absorbs something.

absorb; → -er.

absorbing wedge
  گُوه‌ی ِ درشمنده   
gove-ye daršamandé

Fr.: coin absorbant   

Optics: A strip or annulus of material, such as glass or film, whose density increases progressively from one end to the other. The function of the wedge is to weaken the light beam in an optical system.

Verbal adj. from → absorb; → wedge.


Fr.: absorption   

1) General: The process or fact of absorbing.
2) Physics: The action of energy or matter penetrating or being assimilated into a body of matter with no reflection or emission. → adsorption, → desorption, → sorption.
See also: → absorption band, → absorption coefficient, → absorption curve, → absorption feature, → absorption line, → absorption nebula, → absorption spectrum, → atmospheric absorption, → discrete absorption component, → foreground absorption, → intergalactic absorption, → internal absorption, → interstellar absorption, → mass absorption coefficient, → photoabsorption, → selective absorption, → self-absorption.

Verbal noun of → absorb; → -tion, from L. absorptionem.

absorption band
  باند ِ درشمی   
bând-e daršami

Fr.: bande d'absorption   

1) A series of very closely spaced absorption lines in stellar spectra resulting from the absorption of light by molecules. Bands caused by titanium oxide (→ TiO bands) and carbon compounds occur in the spectra of low temperature M and C stars.
2) A range of wavelengths, usually in electromagnetic radiation, that are absorbed by a given substance. Absorption bands are characteristic of molecules and correspond to changes of electron orbits in the molecules. See also → anomalous dispersion.

absorption; → band.

absorption coefficient
  همگر ِ درشم   
hamgar-e daršam

Fr.: coefficient d'absorption   

The fraction of normally incident light that is absorbed per unit path length or by a unit mass of absorbing medium.

absorption; → coefficient.

absorption curve
  خم ِ درشم   
xam-e daršam

Fr.: courbe d'absorption   

A graphic representation of the amount of radiant energy absorbed by a material as a function of the wavelength.

absorption; → curve.

absorption feature
  آرنگ ِ درشم   
ârang-e daršam

Fr.: motif d'absorption   

A dip in a spectrum indicating that light has been absorbed on the path from the emitting source to the observer. It may be a line, corresponding to a well-defined atomic or molecular transition, or a more complex feature whose physical origin is not necessarily understood.

absorption; → feature.

absorption line
  خط ِ درشمی   
xatt-e daršami

Fr.: raie d'absorption   

A dark line in the spectrum of a source produced by a lower temperature gas cloud lying between the source and the observer.

absorption; → line.

absorption nebula
  میغ ِ درشمی   
miq-e daršami

Fr.: nébuleuse par absorption, nébuleuse obscure   

A dark cloud of dust and gas that absorbs light from and impedes the view of background stars; dark nebula.

absorption; → nebula.

absorption spectrum
  بیناب ِ درشمی   
binâb-e daršami

Fr.: spectre d'absorption   

A spectrum of absorption lines or bands, produced when light from a hot source, itself producing a continuous spectrum, passes through a cooler gas.

absorption; → spectrum.


Fr.: absorptivité   

The ratio of energy absorbed by a body to energy incident upon the same body.

Absorptivity, from absorptive adj. from → absorb + → -ity, suffix expressing state or condition.

Daršamâyi, from daršamâ quality adj. from daršam, present stem of daršamidan + -yi noun suffix.

absorptivity-emissivity ratio
  وابر ِ درشما‌یی-گسیلا‌یی   
vâbar-e daršamâyi/gosilâyi

Fr.: rapport absorptivité-émissivité   

For a spatial object, the ratio between its absorption of solar radiation and its infrared emission.

absorptivity; → emissivity; → ratio.

  ۱) آهنجیده؛ ۲) آهنجیده، چکیده   
1) âhanjidé (#); 2) âhanjidé (#), cekidé (#)

Fr.: 1) abstrait; 2) abstrait, sommaire   

1a) (adj.) A designation of what derives from → abstraction. Contrasted to → concrete.
1b) Dissociated from any concrete reality or specific instance.
2a) (n.) An abstract thing or state.
2b) A summary of a scientific article, document, speech, etc.

M.E., from L. abstractus "drawn away," p.p. of abstrahere "to draw away, withdraw," from abs- "away," from → ab- + trahere "to draw," → attract.

1) Âhanjidé, p.p. of âhanjidan, variants âhixtan, âxtan "to draw, pull, extract," → object.
2) Cekidé, literally "dropped, oozed out," from cekidan "to drop, distill, fall in small portions, as water," from cek, cekké "a drop, as water," probably an onomatopoeia.

abstract object
  بر‌آخت ِ آهنجیده   
barâxt-e âhanjidé

Fr.: objet abstrait   

An entity that does not exist in space or time and is not perceptible. Some examples are universals, sets, geometrical figures, and numbers.

abstract; → object.

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