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: 13176 Search : far
galvanic couple
  جفت ِ گالوانی   
joft-e gâlvâni

Fr.: couple galvanique   

A pair of dissimilar conductors, commonly metals, in electrical contact.

galvanism; → couple.

galvanic current
  جریان ِ گالوانی   
jarayân-e gâlvâni

Fr.: courant galvanique   

The direct electric current that flows between metals or conductive nonmetals in a → galvanic couple.

galvanism; → current.

galvanism
  گالوانیسم   
gâlvânism

Fr.: galvanisme   

1) The production of electricity from a chemical reaction.
2) The therapeutic application of electricity to the human body.

From Fr. galvanisme, after Luigi Galvani (1737-1798), the Italian physiologist, who demonstrated (1790) muscular action due to contact with dissimilar metals.

galvanization
  گالوانش   
gâlvâneš

Fr.: galvanisation   

The coating of steel or iron with → zinc, either by immersion in a bath of molten zinc or by electrolytic deposition from a solution of zinc sulfate, to give protection against corrosion.

Verbal noun of → galvanize.

galvanize
  گالوانیدن   
gâlvânidan

Fr.: galvaniser   

1) To coat a metal with → zinc by dipping into molten zinc or by electrolytic deposition.
2) To stimulate by application of an electric current.

From Fr. galvaniser, from galvanisme, → galvanism.

Gâlvânidan, from Gâlvâni, → galvanism, + -idan, → -ize.

galvano-
  گالوانو-   
gâlvâno-

Fr.: galvano-   

A prefix denoting galvanic or galvanism in compound words, such as → galvanometer, → galvanoplasty.

Galvano-, from → galvanism.

galvanometer
  گالوانوسنج   
gâlvânosanj

Fr.: galvanomètre   

An instrument for measuring or detecting small → direct currents, usually by the mechanical reaction between the magnetic field of the current and that of a magnet.

galvano- + → -meter.

galvanoplasty
  گالوانوپوشی   
gâlvânopuši

Fr.: galvanoplastie   

A process used for covering an object with a thin layer of metal by electrochemical means.

galvano- + -plasty a suffix meaning "molding, formation, surgical repair, plastic surgery," from Gk. -plastia, from plastos "molded, formed," from plassein "to mold."

Gâlvânopuši, from gâlvâno-, → galvano-, + puši "covering, coating," from pušidan "to cover; to put on" (Mid.Pers. pôšidan, pôš- "to cover; to wear;" cf. Mid.Pers. pôst; Mod.Pers. pust "skin, hide;" O.Pers. pavastā- "thin clay envelope used to protect unbaked clay tablets;" Skt. pavásta- "cover," Proto-Indo-Iranian *pauastā- "cloth").

game
  بازی   
bâzi (#)

Fr.: jeu   

1) An amusement or pastime.
2) The material or equipment used in playing certain games.
3) A competitive activity involving skill, chance, or endurance on the part of two or more persons who play according to a set of rules, usually for their own amusement or for that of spectators (Dictionary.com).

M.E. gamen. O.E. gaman "game, joy, fun, amusement;" cf. O.Fris. game "joy, glee," O.N. gaman, O.H.G. gaman "sport, merriment," D. gamen, Sw. gamman.

Bâzi, from Mid.Pers. wâzig "game, play," related to bâzidan "to play," bâxtan/bâz- "to loose (in game);" Proto-Ir. *uāz- "to play, contend;" cf. Skt. vāja- "contest, war, gain, reward" (Cheung 2007).

gamma
  گاما   
gâmmâ

Fr.: gamma   

1) The third letter of the Greek alphabet (γ, Γ).
2) Symbol used to denote the ratio of the principal specific heats CP/CV of a gas, where CP is the specific heat at constant pressure and CV that measured at constant volume.
3) Unit of magnetic field intensity, equal to 10-5 gauss.
4) The distance of the Moon's shadow axis from Earth's center in units of equatorial Earth radii. It is defined at the instant of → greatest eclipse when its absolute value is at a minimum (F. Espenak, NASA).

The third letter of the Gk. alphabet, from Gk. gamma, from Phoenician gimel.

Gamma Cephei
  گاما کفءوس   
gâmâ Kefeus

Fr.: γ Cephei   

A bright, third → magnitude (3.22) → giant star of → spectral type K1, also called → Errai, HR 8974, HIP 116727, and HD 222404. γCephei has a → surface temperature of 4920 K a mass of 1.40 Msun, a → luminosity 10.6 solar, and a radius 4.8 solar. Its distance is estimated to be 45 → light-years. γ Cephei will become the → Pole Star in about 2,000 years. γ Cephei has a low mass → companion (B), a main → main sequence star of spectral type M4 V with a mass of 0.4 Msun. It orbits the → primary star every 67.5 years. An → extrasolar planet. (γ Cephe b) has been discovered orbiting the main star.

Gamma, as in → Bayer designation; → Cepheus.

Gamma Cygni
  گاما ماکیان   
gâmâ Mâkiyân

Fr.: γ Cygni   

The star → Sadr.

Gk. letter → gamma; Cygni, genitive of → Cygnus.

gamma decay
  تباهی ِ گاما   
tabâhi-ye gâmâ (#)

Fr.: désintégration gamma   

A type of → radioactivity in which some unstable atomic nuclei dissipate excess energy by a spontaneous electromagnetic process, usually accompanied by → alpha decay or → beta decay.

gamma; → decay.

gamma mechanism
  ساز-و-کار ِ گاما   
sâzokâr-e γ

Fr.: mécanisme γ   

A process which reinforces the → kappa mechanism in a → partial ionization zone. Because the temperature in the partial ionization zone is lower than in the adjacent stellar layers, heat tends to flow into the zone during compression, prompting further ionization.

γ, after the smaller ratio of → specific heats caused by the increased values of Cp and Cv; → mechanism.

gamma rays
  پرتوها‌ی ِ گاما   
partowhâ-ye gâmmâ (#)

Fr.: rayons gamma   

An → electromagnetic wave with a typical → wavelength less than 10-2Å (10-12 m), corresponding to frequencies above 1019 Hz and photon energies above 100 → keV.

gamma; → ray.

gamma-ray astronomy
  اخترشناسی ِ پرتوها‌ی ِ گاما   
axtaršenâsi-ye partowhâ-ye gâmmâ (#)

Fr.: astronomie en rayons gamma   

The study of → gamma rays from → extraterrestrial → sources, especially → gamma-ray bursts.

gamma ray; → astronomy.

gamma-ray burst (GRB)
  بلک ِ پرتوها‌ی ِ گاما   
belk-e partowhâ-ye gâmmâ

Fr.: sursaut de rayons gamma   

An intense discharge of → gamma rays, which range in duration from tenth of a second to tens of seconds and occur from sources widely distributed over the sky. The radio wave → afterglow from the → burst can last more than a year, making long-term observations of the sources possible. The favored hypothesis is that they are produced by a relativistic jet created by the merger of two → compact objects (specifically two → neutron stars or a neutron star and a → black hole). Mergers of this kind are also expected to create significant quantities of neutron-rich radioactive species, whose decay should result in a faint → transient, known as a → kilonova, in the days following the burst. Indeed, it is speculated that this mechanism may be the predominant source of stable → r-process elements in the Universe. Recent calculations suggest that much of the kilonova energy should appear in the → near-infrared spectral range, because of the high optical opacity created by these heavy r-process elements (Tanvir et al., 2017, Nature 500, 547).

gamma rays; → burst.

gamma-ray burster
  بلکور ِ پرتو ِ گاما   
belkvar-e partow-e gâmmâ

Fr.: source à sursaut gamma   

The → object or → phenomenon at the origin of a → gamma-ray burst.

gamma ray; → burster.

gamma-ray source
  خن ِ پرتوهای ِ گاما   
xan-e partowhâ-ye gâmma

Fr.: source de rayons gamma   

1) An astronomical object that emits → gamma rays.
2) A radioactive material that emits gamma rays in a form that can be used in medical imaging.

gamma ray; → source.

Gamma2 Velorum
  گاما۲ بادبان   
gâmâ2 bâdbân

Fr.: γ2 Velorum   

The closest → Wolf-Rayet star, located at 336 → parsecs. Also known as HR 3207, HD 68273, and WR 111. γ2 Velorum is composed of a → WC8 component in a → close binary system with an → O star in a 78.5 day orbit (see, e.g., Lamberts et al., 2017, arXiv: 1701.01124).

Gamma, as in → Bayer designation; Velorum, genitive of → Vela.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>