An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 12955 Search : far
contraction
  ترنگش   
terengeš

Fr.: contraction   

An act or instance of contracting; the quality or state of being contracted.
gravitational contraction, → Kelvin-Helmholtz contraction, → length contraction, → Lorentz contraction.

Verbal noun of → contract.

contradiction
  پادگویی   
pâdguyi (#)

Fr.: contradiction   

1) The act of contradicting; assertion of the contrary or opposite.
2) Logic: A statement that is false under all circumstances.

M.E., from O.Fr. contradiction or directly from L. contradictionem "objection, counterargument," from contradicere, from contra dicere "to speak against," from → contra- "against" + dicere "to speak," akin to Pers. dis, → form.

Pâdguyi, literally "speaking against," from pâd, → counter-, + guyi, from goftan, → logic.

contradictory
  پادگویانه   
pâdguyâné (#)

Fr.: contradictoire   

Asserting the contrary or opposite; contradicting; inconsistent; logically opposite (Dictionary.com).

Adjective from → contradiction.

contrast
  پادسانی   
pâdsâni

Fr.: contraste   

In an → image, the degree of distinction between areas with different → brightness levels; in other words, the → ratio of the brightness between light and → dark areas.

From Fr. contraster, from It. contrastare "stand out against," from V.L. *contrastare "to withstand," from L. → contra- "against" + stare "to stand," (cf. Pers. istâdan "to stand," O.Pers./Av. sta- "to stand, stand still; set," Skt. sthâ- "to stand," Gk. histemi "put, place, weigh," PIE base *sta- "to stand").

Pâdsâni, from pâd- "agianst," → contra- + sân "manner, semblance," variant sun, Mid.Pers. sân "manner, kind," Sogdian šôné "career" + -i noun suffix.

contravariant tensor
  تانسور ِ پادورتا   
tânsor-e pâdvartâ

Fr.: tenseur contravariant   

A tensor whose components are distinguished by → superscript indices.

contra-; + variant; → variance; → tensor.

contribute
  همباژیدن   
hambâžidan

Fr.: contribuer   

1) To give or supply (help, money, etc.) for a common purpose.
2) To provide (ideas, suggestions, work, etc.) for a common goal, such as an article, a book.

From L. contributus, p.p. of contribuere "to bring together, unite, collect," from → com- + tribuere "to pay, assign, allot," from tribus "tribe."

Hambâžidan, from ham- "together," → com-, + bâž "tribute, toll, impost," → distribute.

contribution
  همباژش   
hambâžeš

Fr.: contribution   

1) The act of contributing.
2) Something contributed.

Verbal noun of → contribute.

convection
  همبز، همبرد   
hambaz, hambord (#)

Fr.: convection   

In general, mass motions within a → fluid resulting in transport and mixing of the properties of that fluid when the temperature gradient exceeds some critical value. Convection, along with → conduction and → radiation, is a principal means of → energy transfer. → Schwarzschild's criterion.

From L. convectionem "the act of carrying," from p.p. stem of convehere "to carry together," from → com- "together" + vehere "to carry," cf. Skt. vah- "to carry, lead," vahitra "vehicle," Av. vazaiti "to lead," Mid.Pers. waz-, wazidan "to carry away," Gk. oxos "chariot;" PIE base *wegh- "to go, carry, drive"

Hambaz, from ham- "together" + baz "to carry, move," → evection.
Hambord, from ham- "together," → com- + bord, from bordan "to carry," Mid.Pers. burdan, O.Pers./Av. bar- "to bear, carry," barəθre "to bear (infinitive)," Skt. bharati "he carries," Gk. pherein, L. fero "to carry," PIE base *bher- "to carry."

convection zone
  زنار ِ همبز   
zonâr-e hambaz

Fr.: zone de convection   

Same as → convective zone.

convective
  همبزی   
hambazi

Fr.: convectif   

Of or relating to → convection.

convective cell
  یاخته‌ی ِ همبزی   
yâxte-y hambazi

Fr.: cellule convective   

A body of → fluid which transports energy through the → convection process.

convective; → cell.

convective cloud
  ابر ِ همبزی   
abr-e hambazi

Fr.: nuage convectif   

Meteorology: A cloud that owes its vertical development, and possibly its origin, to convection.

convective; → cloud.

convective core
  مغزه‌ی ِ همبزی   
maqze-ye hambazi

Fr.: cœur convectif   

The central region of a → massive star where → convection prevails due to steep gradient of temperature relative to pressure.

convective; → core.

convective envelope
  پوشه‌ی ِ همبزی   
puše-ye hambazi

Fr.: enveloppe convective   

1) A → convective zone situated beneath the surface of solar type stars.
2) Stellar models show that → massive stars also possess an outer convective envelope encompassing several percent of the stellar radius. Fast rotation amplifies the size of the convective envelope in → OB stars and developes anisotropic convective envelops (Maeder et al. 2008, A&A 479, L37).

convective; → envelope

convective overshooting
  فرازد ِ همبزی   
farâzad-e hambazi

Fr.: dépassement convectif   

In a → massive star, penetration of the upper layers of the → convective core into the → radiative zone due to → turbulence effects. The enlargement of the convective core results in more luminous stars in theoretical models.

convective; → overshooting.

convective vortex
  گردشار ِ همبزی   
gerdšâr-e hambazi

Fr.: tourbillon convectif   

A common feature of the atmosphere that ranges from small-scale → vortices such as → dust devils, to large-scale systems such as → cyclones.

convective; → vortex.

convective zone
  زنار ِ همبزی   
zonâr-e hambazi

Fr.: zone convective   

A zone inside a star in which → convection takes place; the central → core in → massive stars and the zone underneath → photosphere in low mass stars like the Sun. Recent works predict the presence of a thin convection zone in sufficiently massive main sequence stars which originates from the iron opacity and partial helium ionization. See also → iron convection zone.

convective; → zone.

converge
  همگراییدن   
hamgerâyidan (#)

Fr.: converger   

1) General: To tend to meet in a point; incline toward each other.
2) Math: (of an infinite series) to have a finite sum. (of an improper integral) to have a finite value.

From L.L. convergere "to incline together" from → com- "together" + vergere "to bend."

Hamgerâyidan, from ham- "together," → com- + gerâyidan "to incline toward, verge on; to intend," Mid.Pers. grayidan "to lean, incline; to intend, desire," → diverge.

convergence
  همگرایی   
hamgerâyi (#)

Fr.: convergence   

1) General: Act or state of converging.
2) Math: The property of a → sequence or → series which ensures that it will approach a definite → finite limit. See also: → divergence.

From converg-, from → convergent + -ence, equivalent to → -ance.

Hamgerâyi, verbal noun from hamgerâyidan, → converge.

convergent
  همگرا   
hamgerâ (#)

Fr.: convergent   

Coming together, as a light beam after passing through a convex lens which brings the beam into the focus.

Verbal ddj. from → converge.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee 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 dua dus dwa dyn e-f Ear ecl eco edu eig Ein ela ele ele ele Ele elo emi emp ene Enl env epi equ equ Eri est Euc eva evo exc exc exh Exo exp exp ext ext f(R fac fam fat fee Fer Fib fig fin fir fix fle flu foc for for for fra fre Fre fri fun fuz Gal gal gal Gam gau Gay gen Geo geo geo geo gim glo gov gra gra gra gra gre gro Gun hab hal han Har haz hea hel hel Hen Her het Hig hil hol Hoo hor hou Hub hum hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind Ind inf inf inf inf inn ins ins int int int int int int int int inv ion ion Irr iso iso iso jan jit Jul jus Kel ker kin kni La lam lan Lap las lat Lay Led Len let lif lig lin lin lin liq Lit loc log lon lou low lum lun Lym M d Mag mag mag mag mag mag maj man mar mas mas mat mea mea mec mem mer Mes met met mho mic Mie Mil min mis MKS MOd mol Mon moo mot mul mul myo nak Nas nat neb neg neu neu New New nit noi non non nor nor nuc nuc nul nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi pai Pan par par Par par pas Pav Pel per per per per Per per pha phi pho pho pho phy Pip Pla pla PLA pla ple plu pol pol pol pol pop pos pos pot Pra pre pre pre Pri pri pri pro pro pro pro pro pro pro Pto pul pur 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 rep res res res res ret RHB rid rig ris roc Ros rot rub Rut Sag sam sat sca sca Sch sci Sea sec sec see sel sem sen set Sha sha shi shu sid sil sim sin SIS ski Slo smo Soc sol sol sol sol son sou spa spa spe spe spe sph spi spi Spo squ sta sta sta sta Ste ste ste sto str str str sub sub suc sun sup sup sup sup sur Swa syn syn tab tar tel tem ter tes the the the the Tho thr tid tim Tit top tot tra tra TRA tra tre tri tri tru Tun Tus tym Typ ult unb und uni uni uns upp Urs vac van var Vei Ven ver vic Vir vir vis vol W 4 war wat wav wea wed wet wid win WN2 Wol wri xen yok zen zin > >>