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: 13116 Search : far
holocaust
  هروسوچ   
harusuc

Fr.: holocauste, shoa   

1) A great or complete devastation or destruction, especially by fire.
2) (usually initial capital letter, preceded by the) The systematic mass slaughter of European Jews in Nazi concentration camps during World War II (Dictionary.com).

M.E., from L.L. holocaustum, from Gk. holokaustos "burnt whole;" see → holo- "complete, entire, total," → caustic "burning; burnt."

Harusuc "entirely burnt;" → holo-, → caustic "burning; burnt."

hologram
  هرونگاشت   
harunegâšt (#)

Fr.: hologramme   

A three-dimensional image produced with the technique of → holography.

holo-; → -gram.

holographic
  هرونگاریک   
harunegârik

Fr.: holographique   

Of, relating to, or produced using → holography; three-dimensional.

holo- + → -graphic.

holographic grating
  توری ِ هرونگاریک   
turi-ye harunegârik

Fr.: réseau holographique   

A → diffraction grating produced from a series of constructive → interference fringes. The fringes, whose intensities vary in a sinusoidal pattern, correspond to the grooves of the grating. They are recorded on a photosensitive substrate and subsequently treated using a chemical procedure. Since the grooves are created by the interference of light, such a grating is free from the random and periodic errors present in → ruled gratings.

holographic; → grating.

holography
  هرونگاری   
harunegâri (#)

Fr.: holographie   

A technique for making three-dimensional images by recording → interference patterns from a split → laser beam on a medium such as photographic film. One of the → coherent beams irradiates the object, the second beam illuminates a recording medium. The two beams produce an interference pattern, called → hologram, on the film. The hologram contains information on both → phase and → amplitude of the object. However, this information is in a coded form, and the image must be reconstructed. When the object is removed and the hologram is illuminated by the laser from the original direction, a 3-dimensional image of the object appears where the object was originally, as if it were not removed. The visible object seems so real that the observer can detect → parallax by changing the position of one's head.

From → holo- "whole" + → -graphy. By using the term holography, Dennis Gabor (1900-1979), the Hungarian-British electrical engineer and inventor, wanted to stress that the technique records complete information about a wave, both about its amplitude and its phase, in contrast to the usual photography in which only the distribution of the amplitude is recorded.

holonomic system
  راژمان ِ هروداتیک   
râžmân-e harudâtik

Fr.: système holonomique   

A material system in which the → constraints can be expressed in the form of an equation relating the coordinates.

From Gk. → holo- "whole" + -nomic, related to nomos "law, managing, governing, custom," → -nomy; → system.

homage
  بزرگداشت   
bozorgdâšt (#)

Fr.: hommage   

1) Respect or reverence paid or rendered.
2) Something done or given in acknowledgment or consideration of the worth of another (Dictionary.com).

M.E. (h)omage, from O.Fr. homage "allegiance or respect for one's feudal lord," from homme "man," → human, + -age.

Bozordgâšt, literally "considered to be great," from bozorg "large, magnificent, great," → magnify, + dâšt, dâštan "to maintain, consider, possess, keep in mind, hold, have," → property.

homo-
  هم-   
ham- (#)

Fr.: homo-   

A combining form meaning "same" used in the formation of compound words. Also, especially before a vowel, hom-.

Homo-, from Gk. homos "one and the same," also "belonging to two or more jointly," from PIE *somos; cf. Pers. ham-, as below; Lith. similis "like," Goth. sama "the same," samana "together."

Ham- "together, with; same, equally, even," Mid.Pers. ham-, like L. com- and Gk. syn- with neither of which it is cognate. O.Pers./Av. ham-, Skt. sam-; also O.Pers./Av. hama- "one and the same," Skt. sama-, Gk. homos-; originally identical with PIE numeral *sam- "one," from *som-. The Av. ham- appears in various forms: han- (before gutturals, palatals, dentals) and also hem-, hen-.

homocentric spheres
  سپهرهای ِ هم‌مرکز   
sepehrhâ-ye ham-markaz

Fr.: sphères homocentriques   

Concentric → spheres of Eudoxus.

homo-; → center; → -ic; → sphere.

homodyne
  هومودین   
homodin

Fr.: homodyne   

Of, or pertaining to the process of combining two waves, such as → electromagnetic waves, of the same → frequency. See also: → heterodyne.

Homodyne, from → homo- + -dyne, from Gk. dynamicsdynamics.

homogeneity
  همگنی   
hamgeni (#)

Fr.: homogénéité   

State or quality of having a uniform appearance or composition, being homogeneous

homogeneous + → -ity.

homogeneous
  همگن   
hamgen (#)

Fr.: homogène   

1) Of uniform composition or having a common property throughout.
2) Math.: Of the same kind so as to be commensurable. Of the same degree or dimension. → anisotropic homogeneous cosmological model, → homogeneous fluid, → homogeneous linear differential equation, → homogeneous Universe, → homogeneous turbulence, → inhomogeneous, → nonhomogeneous, → nonhomogeneous linear differential equation.

Homogeneous, from M.L. homogeneus, from Gk. homogenes "of the same kind," from homos "same," → homo-, + genos "race, kind," gonos "birth, offspring," from PIE base *gen-/*gon-/*gn- "to produce, beget, be born," cf. Av. zan- "to bear, give birth to a child, be born," infinitive zazāite, zāta- "born," zana- "race" (in sruuô.zana- "belonging to the race of the horned ones"), O.Pers. zana- "tribe" (in paru-zana- "consisting of many tribes"), Skt. janati "begets, bears," jana- "creature, human being, race, tribe, people;" L. genus "race, stock, kind," gignere "to beget."

Hamgen "of the same kind, like each other; friend, partner," from ham-, → homo-, + gen "kind," O.Pers./Av. zana- "race; tribe," cognate with L. genus, as above). Alternatively, gen may be a variant of Mid./Mod.Pers. gôn/gun "kind, type; manner; color, skin color," from Av. gaona- "hair, hair color, color."

homogeneous fluid
  شارّه‌ی ِ همگن   
šârre-ye hamgen (#)

Fr.: fluide homogène   

A fluid with uniform properties throughout, but meteorologists sometimes designate as homogeneous a fluid with constant density.

homogeneous, → fluid.

homogeneous linear differential equation
  هموگش ِ دگرسانه‌ای ِ خطی همگن   
hamugeš-e degarsâne-yi-ye xatti hamgen

Fr.: équation différentielle linéaire homogène   

A → linear differential equation if the right-hand member is zero, Q(x) = 0, on interval I.

homogeneous; → linear; → differential; → equation.

homogeneous turbulence
  آشوبناکی ِ همگن   
âšubnâki-ye hamgen (#)

Fr.: turbulence homogène   

Turbulence in which spatial derivatives of all mean turbulent quantities are negligible.

homogeneous, → turbulence.

homogeneous Universe
  گیتی ِ همگن   
giti-ye hamgen (#)

Fr.: Univers homogène   

A model Universe which is homogeneous and → isotropic on large scales. It is modeled by a → Robertson-Walker cosmology. A homogeneous Universe is filled with a constant density and negligible pressure. Any small spatial region is characteristic for the whole Universe.

homogeneous; → Universe.

homomorphism
  هم-ریخت‌مندی   
ham-rixtmandi

Fr.: homomorphisme   

A → mapping between two mathematical → objects that preserves the object structure. A general → morphism.

homo-; → morphism.

homonuclear molecule
  مولکول ِ هم‌هسته   
molekul-e ham-hasté

Fr.: molécule homonucléaire   

A molecule that is composed of only one type of → chemical element, e.g. the → molecular hydrogen and → ozone.

homo-; → nuclear; → molecule.

Homunculus Nebula
  میغ ِ آدمک   
miq-e âdamak

Fr.: nébuleuse de l'Homoncule   

A nebula of gas and dust (about 17" x 12" in size), which surrounds the massive star Eta Carinae and lies about 7500 light-years away. The surrounding material was ejected by the massive star in 1843 during its violent eruption, and is now expanding at about 500 km/sec.

Homunculus, "a diminutive human being; little man" (since the nebula resembled a small human to early observers), from L. homin-, homun-, homo "eartly being," humus "the earth" (cf. Pers. zamin "earth, ground," Mid.Pers. zamig "earth;" Av. zam- "the earth;" Skt. ksam; Gk. khthôn, khamai "on the ground;" PIE root *dh(e)ghom "earth") + → -ula, -ule; → nebula.

Miq, → nebula; âdamak "little man."

hook
  قلاب   
qollâb

Fr.: crochet   

1) A curved or bent piece of metal or other hard material for catching, holding, or hanging something.
2) Something curved or bent like a hook.

M.E. hoke, O.E. hoc "hook, angle;" cf. M.Du. hoek, Du. haak, Ger. Haken "hook."

Qollab "a hook, a hooked device," probably ultimately from Proto-Ir. gart- "to turn;" cf. Pers. gard-, gardidan, gaštan "to turn, to wind;" cognate with dialectal qellidan "to roll."

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- 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 Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg 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 > >>