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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<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit 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 con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg 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 Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad 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 Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr 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 tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>

Number of Results: 13048 Search : far
hurricane
  توفند   
tufand (#)

Fr.: ouragan   

An intense warm-core oceanic cyclone that originates in tropical latitudes; called a typhoon in the western Pacific Ocean. Sustained winds are 120 km per hr or higher.

Hurricane, from Sp. huracán, from Taino (the language of an extinct Arawakan Indian tribe of the West Indies) hurakán.

Tufand, from tufidan "to roar, to raise a tumult," tufân "storm, the roaring of the sea, the confused hum of men or animals." Is this Persian word related to Gk. typhon "whirlwind," personified as a giant, father of the winds?

hurry
  ۱) تاوش؛ ۲) تاوشیدن   
1) tâveš; 2) tâvešidan

Fr.: 1) hâte; 2) se dépêcher, se presser   

1) A state of urgency or eagerness; haste
2) (often followed by up) To move, proceed, or act with haste (Dictionary.com).

Of uncertain origin.

Tâveš, from Tâleši tâveš "hurry, haste," tâvisté "to hurry up;" variant Kurd. (Mahâbâd) tus "hasty."

Huygens
  هویگنس   
Huygens

Fr.: Huygens   

Christiaan Huygens (1629-1695), an outstanding Dutch mathematician, astronomer, physicist, and horologist. → Huygens Division, → Huygens Region, → Huygens' principle, → Huygens-Fresnel principle.

Huygens Division
  شکاف ِ هویگنس   
šekâf-e Huygens

Fr.: division de Huygens   

In the system of → Saturn's rings, the gap at the inner edge of the → Cassini division at a distance of 117,680 km from the center of the planet with a width of 285-400 km.

Huygens; → division.

Huygens Region
  ناحیه‌ی ِ هویگنس   
nâhiye-ye Huygens

Fr.: région de Huygens   

The inner bright part of the → Orion Nebula, from which most of the radiation is emitted. It is about 5' across corresponding to 0.7 pc (for a distance of 440 pc). See O'Dell (2001, ARAA 39, 99).

Named after the Dutch astronomer Christiaan → Huygens (1629-1695), who sketched the appearance of the Orion Nebula. His drawing, the first such known sketch, was published in Systema Saturnium in 1659. First named such by O. Gingerich (1982, Ann. NY Acad. Sci. 395, 308); → region.

Huygens' principle
  پروز ِ هویگنس   
parvaz-e Huygens

Fr.: principe de Huygens   

Every point of a → wavefront may be considered as a center of a secondary disturbance which gives rise to spherical wavelets, and the wavefront at any later instant may be regarded as the envelope of these wavelets. This statement suffices to account for the laws of → reflection and → refraction, and the approximately straight line propagation of light through large apertures, but it fails to account for → diffraction, the deviations from exact straight line propagation of light. Huygens' principle was later extended by Fresnel and led to the formulation of → Huygens-Fresnel principle, which is of great importance in the theory of diffraction.

Huygens; → principle.

Huygens-Fresnel principle
  پروز ِ هویگنس-فرنل   
parvaz-e Huygens-Fresnel

Fr.: principe Huygens-Fresnel   

A development of → Huygens' principle stating that every point on a → wavefront acts, at a given instant, as a source of outgoing secondary spherical waves. The secondary wavelets mutually interfere and the resulting net light amplitude at any position in the outgoing wavefront is the vector sum of the amplitudes of all the individual wavelets. Using this principle, Fresnel calculated with a high accuracy the distribution of light in → diffraction patterns. The Huygens-Fresnel principle was put on a firm theoretical basis by Kirchhoff and expressed as an integral derived from the → wave equation.

Huygens; → Fresnel diffraction; → principle.

Hyades
  هو‌آدس   
Huâdes (#)

Fr.: Hyades   

A young, nearby cluster of stars (spectral types A1-K) visible to the naked eye in the constellation → Taurus about 150 light-years away. Its individual stars (more than 200) appear to spread out in space. → Aldebaran is a foreground star in that region of the sky.

In Gk. mythology, a group of nymphs and sisters of Hyas, or else his daughters, and when Hyas died while hunting, killed by a lion or a boar, they grieved his death exceedingly, and turned into the stars called Hyades.

Huâdes, from Gk., as above.

hybrid
  دورگه   
doragé (#)

Fr.: hybride   

Composed of two distinct races, breeds, varieties, species, or heterogeneous elements.

Hybrid, from L. hybrida, from ibrida "a crossbred animal," of unknown origin.

Doragé, literally "of two veins, races," from do, → two, + ragé, from rag "vein; lineage; race," → vessel.

hybrid eclipse
  خورگرفت ِ دورگه   
xorgereft-e doragé (#)

Fr.: éclipse solaire hybride   

A rare type of solar eclipse where at some places the eclipse is annular while at other places it appears total. This duality comes about when the vertex of the Moon's umbral shadow pierces Earth's surface at some points, but falls short of the planet along other portions of the eclipse path. Hybrid eclipses are also known as → annular-total eclipses. In most cases, hybrid eclipses begin as annular, transform into total, and then revert back to annular before the end of their track. In rare instances, a hybrid eclipse may begin annular and end total, or vice versa (F. Espenak, NASA).

hybrid; → eclipse.

hybrid pulsator
  تپگر ِ دورگه   
tapgar-e doragé

Fr.: pulsateur hybride   

A star on the upper → main sequence which simultaneously exhibits low-order pressure mode (→ p mode) and high-order gravity mode (→ g mode) characteristic of β Cephei and → slowly pulsating B stars, respectively. Examples include: γ Pegasi, HD 43317, and HD 50230.

hybrid; → pulsator.

hybrid star
  ستاره‌ی ِ دورگه   
sétâre-ye doragé

Fr.: étoile hybride   

A hypothetical object composed of a → quark matter in the central regions, enveloped by ordinary → hadronic matter.

hybrid; → star.

hydr-
  هیدر-، آب-   
hidr- (#), âb- (#)

Fr.: hydr-   

hydro-.

Hydra
  هودرا   
hudrâ

Fr.: Hydre   

1) The Water Serpent. The longest and largest constellation in the sky, stretching almost 7 hours of right ascension, and covering over 1300 square degrees, from → Canis Minor to → Libra. It lies south of → Cancer, → Leo, and → Virgo, and is best seen in the northern hemisphere during the months of February through May. Its brightest star is → Alphard. Abbreviation: Hya; Genitive: Hydrae.
2) The third satellite of → Pluto discovered in 2005 by astronomers using the → Hubble Space Telescope images. Also called Pluto III (P3). It has an estimated diameter of between 60 and 170 km and an → orbital period of 38.2 days. It orbits the → barycenter of the → Pluto-→ Charon system at a distance of about 65,000 km.

Hydra, from L. hydrus, from Gk. hydra "water-snake;" cf. Av. udra- "otter;" Skt. udrá- "otter;" O.H.G. ottar "otter;" O.E. otor, ottor; Ger. Otter; E. otter; Lith. udras, udra "otter;" akin to → water. In Gk. mythology, this constellation represents the gigantic nine-head water-snake which haunted the swamps of Lerna. Herakles was sent to destroy her as one of his twelve labours, but for each of her heads that he decapitated, two more sprang forth. So with the help of Iolaos, Herakles applied burning brands to the severed stumps, cauterizing the wounds and preventing regeneration. In the battle he also crushed a giant crab (→ Cancer) beneath his heel which had come to assist Hydra.

Hudrâ, from Gk. hydra, as above. → Hydrus (آبمار)

Hydra I cluster
  خوشه‌ی ِ هودرا   
xuše-ye Hudrâ

Fr.: amas de l'Hydre   

A relatively poor → galaxy cluster at about 50 Mpc containing a pair of bright galaxies near its centre: NGC 3309 and NGC 3311. Also known as Abell 1060 (→ Abell catalog), Hydra I is the prototype of an evolved and dynamically relaxed cluster, being dominated by early-type galaxies and having a regular core shape.

Hydra; → cluster.

hydrate
  هیدریدن، آبیدن   
hidridan, âbidan (#)

Fr.: hydrater   

To combine chemically with → water.

From → hydr-, → hydro- + -ate a verbal suffix.

Hidridan, from Gk. → hydr-, âbidan, from âb, → water, + -idan infinitive suffix.

hydrated
  هیدریده، آبیده   
hidridé, âbidé (#)

Fr.: hydraté   

Combined with → water molecules.

P.p./adj. of → hydrate.

hydration
  هیدرش، آبش   
hidreš, âbeš (#)

Fr.: hydratation   

The process of combining with → water.

Verbal noun of → hydrate.

hydraulic
  هیدرولیک   
hidrolic (#)

Fr.: hydraulique   

Operated, moved, or employing water or other liquids in motion.

From Gk. hydraulikos organon "water organ," from → hydro- "water" + aulos "musical instrument, hollow tube."

hydraulic ram
  قوچ ِ هیدرولیک   
quc-e hidrolik

Fr.: bélier hydraulique   

A device, which uses the energy of water flowing by gravity intermittently through a pipe to force a small portion of the water to a height greater than that of the source.

hydraulic; → ram.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit 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 con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg 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 Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad 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 Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr 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 tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>