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
near
  نزدیک   
nazdik (#)

Fr.: proche   

Close; to a point or place not far away.

O.E. near "closer, nearer," comparative of neah, neh "nigh."

Nazdik, from Mid.Pers. nazdik "near," from nazd "close" (Mid.Pers. nazd, nazdik "near," nazdist "first;" O.Pers. ašna- "close;" Av. nazdišta- "nearest, next," nazdyo "nearer to," nas- "to come near, approach, reach;" cf. Skt. nédīyas- "closer, very close," nas- "to approach, to reach") + -ik, → -ic.

near ultraviolet
  فرابنفش ِ نزدیک   
farâbanafš-e nazdik (#)

Fr.: proche ultraviolet   

The longest wavelengths of the ultraviolet region, which are adjacent to the visible, from 200 to 350 nm.

near; → ultraviolet.

near-Earth asteroid (NEA)
  سیارک ِ زمین-نزدیک   
sayyârak-e zamin-nazdik

Fr.: astéroïde géocroiseur   

An → asteroid whose orbit lies partly between 0.983 and 1.3 → astronomical units from the Sun, so that it passes close to the Earth. Currently thousands of near-Earth asteroids are known, ranging in size up to about 30 km. Among them, there are between 500 and 1,000 such asteroids larger than one km in diameter. They are divided into three subclasses: → Amor asteroids, → Apollo asteroids, and → Aten asteroids. See also → near-Earth object.

near; → earth; → asteroid.

near-Earth object (NEO)
  بر‌آخت ِ زمین-نزدیک   
barâxt-e zamin-nazdik

Fr.: géocroiseur   

An → asteroid, → comet, or large → meteoroid whose orbit brings it exceptionally close to the Earth, and which may therefore pose a collision danger. Most such objects are in orbits around the Sun with → perihelion distance less than 1.3 → astronomical units. See also → near-Earth asteroid.

near; → earth; → object.

near-infrared
  فروسرخ ِ نزدیک   
forusorx-e nazdik (#)

Fr.: proche infrarouge   

That region of the → electromagnetic spectrum covering shorter infrared wavelengths. It contains the → infrared windows between about 0.8 and 8 → microns, but the longer wavelength limit is not well defined. See also: → infrared radiation, → mid-infrared, → far-infrared, → submillimeter radiation.

near; → infrared.

nebula
  میغ   
miq (#)

Fr.: nébuleuse   

1) A cloud of gas and dust in the interstellar space. There are three general types: → emission nebulae, → reflection nebulae, and → dark nebulae.
2) A celestial body appearing nebulous or fuzzy when seen with the telescope. Formerly, galaxies, which appeared nebular but are constituted of billions of stars, were not distinguished from truly nebular objects, made of gas and dust.

From L. nebula "mist," nimbus "rainstorm, rain cloud;" cognate with Av. napta- "moist," nabās-câ- "cloud," nabah- "sky;" Pers. nam "moisture;" cf. Gk. nephos "cloud, mass of clouds," nephele "cloud;" Skt. nábhas- "moisture, cloud, mist;" O.H.G. nebul; Ger. Nebel "fog;" O.E. nifol "dark;" PIE base *nebh- "cloud, vapor, fog, moist, sky."

Miq "nebula" (used by Tusi, in Pers. translation of Sufi's "Book of Fixed Stars"), variants meh "fog," mož, Tabari miyâ, Lori/Laki (kara) mozy, Ossetic mig/megæ, from Mid.Pers. mēq "cloud, mist;" Av. mēγa- "cloud;" cf. Skt. meghá- "cloud, overcast weather;" Gk. omikhle "mist;" Lith. miglà "mist, haze;" PIE base *mighlā- "cloud."

nebular
  میغی   
miqi

Fr.: nébulaire   

Of or relating to or resembling a → nebula.

nebula + → -ar.

nebular continuum
  پیوستار ِ میغی   
peyvastâr-e miqi

Fr.: continuum nébulaire   

The part of a nebular object's → spectrum that is created by → free-free emission.

nebular; → continuum.

nebular hypothesis
  انگاره‌ی ِ میغ   
engâre-ye miq

Fr.: hypothèse nébulaire   

The hypothesis first put forward in the 18-th century that the solar system formed from a primeval nebula around the Sun. Same as the → Kant-Laplace hypothesis.

nebular; → hypothesis.

nebular line
  خط ِ میغی   
xatt-e miqi

Fr.: raie nébulaire   

A → forbidden line that is found in the spectra of → interstellar  → ionized gas. The nebular lines are emitted by several atomic species (e.g. O, O+, O++, N+, S++) and correspond to the → transition from the electronic → metastable state 1D to the → ground state  3P. Examples are the doubly ionized oxygen lines [O III] at 4959 and 5007 Å (→ [O III] doublet) and the ionized nitrogen doublet [N II] at 6548 and 6583 Å. See also → auroral line; → transauroral line.

nebular; → line.

nebular variable
  ورتنده‌ی ِ میغی   
vartande-ye miqi

Fr.: variable nébulaire   

A type of eruptive variable star, mainly young FU Orionis and T Tauri types, associated with nebulosity.

nebular; → variable.

nebulium
  نبولیوم   
nebuliom (#)

Fr.: nébulium   

A hypothetical element, the existence of which was postulated in the nineteenth century to account for unidentified emission lines (e.g. at 3727 and 5007 Å) in the spectra of some luminous nebulae. It was also believed that this element had a small atomic weight. However, the advances of chemistry and physics showed that all the light elements were known and there was no place for this elusive element. Those unidentified lines have now been shown to come from known elements, but they are not usually observable under laboratory conditions. → forbidden lines.

From nebul(a), → nebula, + -ium L. neuter suffix.

nebulosity
  میغ‌ناکی   
miqnâki

Fr.: nébulosité   

1) A nebulous form, shape, or mass.
2) The state or condition of being nebulous.
3) A fuzzy celestial object, constituted of gas and dust, generally part of a larger → nebula.

nebulous; → -ity.

nebulous
  میغ‌ناک   
miqnâk

Fr.: nébuleux   

1) Hazy, vague, indistinct, or confused.
2) Cloudy or cloudlike.
3) Of or resembling a nebula or nebulae; nebular (Dictionary.com).

nebula; → -ous.

necessary
  بایسته   
bâyesté (#)

Fr.: nécessaire   

1) Being essential or indispensable.
2) Logic, Math.: A condition which must hold for a result to be true, but which does not guarantee it to be true. → if and only if.

M.E. necessaire, from L. necessarius "unavoidable," , from necesse "unavoidable, indispensable," from ne- "not," → un-, + cedere "to withdraw, go away, yield," → precession.

Bâyesté, p.p. of bây-, bâyestan "to be necessary," from Mid.Pers. abây-, abâyistan "to be necessary" (abâyišn "necessity," abâyišnig "necessary"), from Proto-Ir. *upa-aya- "to reach," from upa-, → hypo-, + ay- "to go, to come," → precession.

necessary and sufficient conditions
  بوتارهای ِ بایسته و بسنده   
butârhâ-ye bâyesté o basandé

Fr.: conditions nécessaire et suffisante   

If event A must occur for event B to occur, then it is said that A is → necessary for B. If event A may cause B but there could be some other cause as well, then it is said that A is sufficient to cause B. See also → if and only if (iff).

necessary; → and; → sufficient; → condition.

necessary truth
  راستینی ِ بایسته   
râstini-ye bâyesté

Fr.: vérité nécessaire   

Logic: A → proposition if its → denial is self-contradictory. Also called "logical truth" and "non-contingent truth."

necessary; → truth.

necessity
  بایستگی   
bâyestegi (#)

Fr.: nécessité   

1) The fact of being necessary or indispensable.
2) Something necessary or indispensable.

necessary; → -ity.

neck
  گردن   
gardan (#)

Fr.: cou   

The part of a person's or animal's → body that connecting the → head to the rest of the body.

M.E. nekke, from O.E. hnecca, cognate with Du. nek "the nape of the neck;" Ger. Nacken, O.Norse hnakki "the nape of the neck."

Gardan "neck;" related to geri, geribân "collar," gerivé "low hill," galu "throat;" Mid.Pers. gartan "neck," galôg, griv "throat;" Av. grīvā- "neck;" cf. Skt. gala- "throat, neck;" Gk. bora "food;" L. gula "throat" (Fr. gueule "(animal) mouth"), gluttire "to gulp down," vorare "to devour;" PIE base *gwer- "to swallow, devour." L. gula; cf. Mod.Pers. galu "throat."

needle
  سوزن   
suzan (#)

Fr.: aiguille   

A slender pointed piece of metal, usually steel. → magnetic needle.

M.E. nedle, O.E. naeðlæ, nedlæ (cf. O.S. nathla, O.N. nal, O.Fris. nedle, O.H.G. nadala, Ger. Nadel); PIE root *(s)ne- "to sew, to spin;" cf. Skt. snayati "wraps up;" Gk. nein "to spin;" L. nere "to spin."

Suzan, Mid.Pers. sôzan, sucan, related to sok "pointed stick for driving cattle;" Av. sūkā- "needle;" cf. Skt. sūcī- "sting;" L. cuneus "wedge;" PIE base kū- "sharp; spike."

<< < -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 > >>