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: 13033 Search : far
isoplanicity
  ایزوبیراهیگی   
izobirâhigi

Fr.: isoplanicité   

The condition in which the wavefronts arriving from different parts of a region of sky undergo almost identical phase perturbations. See also → isoplanatic patch.

isoplanatic; → patch.

isopleth
  ایزوچند، هم‌چند   
izocand, hamcand

Fr.: isoplèthe   

A line on a map connecting points of equal value. For example the contour lines joining points of equal altitude on a topographic map. Some other examples of isopleths are: → isobar, → isoneph, and → isohel.

From Gk. isoplethes, from → iso- + pleth(os) "great number, multitude;" cognate with Pers. por, → full, + -es adj. suffix.

Izocand, from izo-, → iso-, + cand replacing candi (after prefix) "quantity," from Mid.Pers. candih "amount, quantity," from cand "how many, how much; so many, much;" O.Pers. yāvā "as long as;" Av. yauuant- [adj.] "how great?, how much?, how many?," yauuat [adv.] "as much as, as far as;" cf. Skt. yāvant- "how big, how much;" Gk. heos "as long as, until."

isosceles triangle
  سه‌بر ِ دو-پهلو-برابر   
sebar-e do-pahlu-barâbar (#)

Fr.: triangle équilatéral   

A triangle having two sides equal.

From L.L. isosceles, from Gk. isoskeles "with equal legs; that can be divided into two equal parts," from isos "equal, identical," → iso-, + skelos "leg."

Sebar, → triangle, do-pahlu-baraabar, from do, → two, pahlu, → side, barâbar, → equal.

isospin
  ایزو-اسپین   
izospin (#)

Fr.: isospin   

A quantum number based on the assumption that the nucleon (proton and neutron) is a single entity having two states, like → spin. It is conserved by the strong interaction. Same as isotopic spin, isobaric spin.

From → iso- + → spin

isotherm
  ایزودما   
izodamâ

Fr.: isotherme   

Meteo.: A line on a map or graph joining points of equal temperature.

Isotherm, back formation from → isothermal.

Izodamâ, from → iso- + damâ, → temperature.

isothermal
  ایزودما   
izodamâ

Fr.: isotherme   

1) Relating to or having a constant temperature.
2) Pertaining to an → isotherm.

Isothermal, from → iso- + therm, from Gk. therme "heat" thermos "warm;" cognate with Pers. garm "warm" (garmâ "heat, warmth," from Mid.Pers. garmâg; O.Pers./Av. garəma- "hot, warm;" cf. Skt. gharmah "heat;" L. formus "warm," fornax "oven;" P.Gmc. *warmaz; O.E. wearm; E. warm; O.H.G., Ger. warm; PIE *ghworm-/*ghwerm- "warm") + → -al; → process.

Izodamâ, from → iso- + damâ, → temperature.

isothermal process
  فراروند ِ ایزودما   
farâravand-e izodamâ

Fr.: processus isotherme   

A → thermodynamic process that takes place at → constant  → temperature. For the temperature of a system to remain strictly constant, the changes in other coordinates (pressure and volume) must be carried out slowly, and → heat must enter or leave the system to maintain a constant temperature. → polytropic process. Astrophysical examples include the → collapse of a → protostar down the → Hayashi track, and the collapse of a star at the end of its life to become a → white dwarf.

isothermal; → process.

isothermal wind
  باد ِ ایزودما   
bâd-e izodamâ

Fr.: vent isotherme   

A → stellar wind in which the gas is subject to only two forces: the inward directed gravity and the outward directed gradient of the gas pressure.

isothermal; → wind.

isotone
  ایزوتون   
izoton (#)

Fr.: isotone   

One of several nuclides having the same number of neutrons in their nuclei but differing in the number of protons.

Isotone, from → iso- + tone, from Gk tonos "strain, tone, mode," literally, "a stretching," akin to teinein "to stretch," cognate with Pers. tanidan "to spin, twist, weave" (Mid.Pers. tanitan; Av. tan- "to stretch, extend;" cf. Skt. tan- to spin, stretch;" tanoti "stretches," tantram "loom;" Gk. teinein "to stretch, pull tight;" L. tendere "to stretch; PIE base *ten- "to stretch;" Pers. târ "string," tân "thread," tur "fishing net, net, snare," and tâl "thread" (Borujerdi dialect) belong to this family; variants tanta "cobweb," tanadu, tafen, kartané, kârtané, kâtené, Pashtu tanistah "cobweb;" cf. Skt. tantu- "cobweb, thread, string").

isotope
  ایزوتوپ، همجا   
izotop (#), hamjâ (#)

Fr.: isotope   

One of two or more atoms having the same number of protons in its nucleus, but a different number of neutrons and, therefore, a different mass.

Isotope, from → iso- + -tope, from Gk. topos "place."

Izotop, loan from Fr., as above. hamjâ, from ham- "together" → com- + "place" (from Mid.Pers. giyag "place;" O.Pers. ā-vahana- "place, village;" Av. vah- "to dwell, stay," vanhaiti "he dwells, stays;" Skt. vásati "he dwells;" Gk. aesa (nukta) "to pass (the night);" Ossetic wat "room; bed; place;" Tokharian B wäs- "to stay, wait;" PIE base ues- "to stay, live, spend the night").

isotope fractionation
  برخانش ِ ایزوتوپی   
barxâneš-e izotopi

Fr.: fractionnement isotopique   

A slight difference between the → abundances of → isotopes of the same → chemical element owing to → physical or → chemical  → processes. It results in the → enrichment or → depletion of an isotope. Same as → isotopic fractionation.

isotope; → fractionation

isotope shift
  کیب ِ ایزوتوپی   
kib-e izotopi

Fr.: décalage isotopique   

A displacement in the spectral lines due to the different isotopes of an element.

isotope; → shift.

isotopic
  ایزوتوپی   
izotopi (#)

Fr.: isotopique   

Of or relating to an → isotope.

isotope; → -ic.

isotopic fractionation
  برخانش ِ ایزوتوپی   
barxâneš-e izotopi

Fr.: fractionnement isotopique   

Same as → isotope fractionation.

isotopic; → fractionation

isotopic number
  عدد ِ ایزوتوپی   
adad-e izotopi

Fr.: nombre isotopique   

The difference between the number of neutrons in an isotope and the number of protons. Neutron excess.

isotopic; → number.

isotopic ratio
  وابر ِ ایزوتوپی   
vâbar-e izotopi

Fr.: rapport isotopique   

The relative abundances of two isotopes of a given chemical element, such as D/H (deuterium/hydrogen), (carbon) 12C/13C, and (uranium) 235U/238U.

isotopic; → ratio.

isotopic spin
  اسپین ِ ایزوتوپی، ایزو-اسپین   
spin-e izotopi (#), izospin (#)

Fr.: spin isotopique   

Same as → isospin.

isotopic; → spin.

isotopologue
  ایزوتوپولوگ   
izotopolog

Fr.: isotopologue   

Any of molecular entities which differ in their isotopic composition but retain the same → chemical elements, e.g. H2O and HDO.

Abbreviation of → isotopic → analogue.

isotopomer
  ایزوتوپومر   
izotopomer

Fr.: isotopomère   

Any of → isomers having the same number of each isotopic atom but differing in their positions. For example, CH3CHDCH3 and CH3CH2CH2D are a pair of isotopomers.

Short for isotopic isomers.

isotropic
  ایزوگرد، همسان‌گرد   
izogard, hamsângard (#)

Fr.: isotrope   

Having physical properties that do not vary with direction.

iso- + → -tropic.

<< < -es -iv -ti 21- a p abe abs abs acc acc acc act act ada adi ads aes Age Alb Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app app arb are ari art ass ast ast ast Atl ato ato Aug aut Avo azi bac bal ban bar bas bea bel Bet bia Big bin bio bir bla bla blo blu Boh Bon bot Bow bre Bri bro but cal cal Can Cap car cas cat cau cel cen cen cha cha cha che Chi chr cir cir civ Cla clo clu CNO coa coe coi 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 cro Cru cub cur cyc cyl dar dat Daw de- Deb 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 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 erg est Euc eva evo exa exc exe exo exp exp ext ext f m fac fal fas fee Fer fib fie fin Fir fix fle flu foc for for For fou Fra fre Fri ful fuz Gal Gal gal Gam gas Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro gul H-b hal Ham har Hay hea hel hel hem her het Hig hik hol hom hor hot Hub hum hyb hyd hyd hyp hyp ide ign ima imp imp imp inc ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos jun K-T Kep key kin Kol lad Lam lan lar las lat lea leg len lev lig lik lin lin lin Lis lob loc log loo low lum lun lun Lym Mac Mag mag mag mag mag Mag mak map Mar mas mat mat mea mea med mem mer MES met met MHD mic mid mil min mis mix mod mol mom Moo mos Mu mul mus nab nar nat neb neg nes neu New New nig nod non non non Nor noz nuc nul num OB obl obs Occ oct off Ohm on- ope Opp opt opt orb orb org Ori ort osm out ove ozo pal pap par par par pas pat pec pen per per per per per pH pha pho pho pho phy pie pla Pla Pla pla pla Plo poi pol pol pol pol por pos pot pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sag sam sat sca Sch Sch sco sec sec sec seg sel sem sen set sha Sha sho SI sid sil sim sin sis sky slo sna Soc sol sol sol Sol Som sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste sto sto str str sub sub sub sum sup sup sup sup sur sus sym syn sys tan Tay Tem ten ter The the the the thi thr tic tid tim Tol tor tot tra tra tra tra Tri tri tro tru tur two Typ UHE ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis VLT vol wad was wav wav wea wei Whe Wie win WN5 Wol WZ Yag yot zen zir > >>