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: 13048 Search : far
nanodiamond
  نانو-الماس   
nâno-almâs

Fr.: nano-diamant   

The most stable carbon compound with an average particle size of about 5 → nanometers (50 Å). Nanodiamonds are synthesized by detonation of → T.N.T. and then gathering the soot that remains from the explosion.

nano-; → diamond.

nanodust
  نانو-غبار   
nâno-qobâr

Fr.: nano-poussière   

Dust grains at → nanoscale sizes found in various astrophysical environments, such as → interstellar medium and → interplanetary space of our Solar System.

nano-; → dust.

nanometer
  نانومتر   
nânometr (#)

Fr.: nanomètre   

A unit of length equal to 10-9 m, or 10 Å.

nano-; → meter.

nanoparticle
  نانو-ذره   
nâno-zarré

Fr.: nano-particule   

A solid particle of → nanoscale size; e.g. a → nanodust grain.

nano-; → particle.

nanoscale
  نانو-مرپل   
nâno-marpel

Fr.: nano-échelle   

The size range from approximately 1 → nanometer (nm) to 100 nm.

nano-; → scale.

nanotechnology
  نانو-تشنیک‌شناسی   
nâno-tašnik-šenâsi

Fr.: nanotechnologie   

The science and technology of producing and exploiting structures and systems at dimensions of roughly 1 to 100 → nanometers, that is those of single atoms and molecules. Materials with such minute structures possess mechanical, optical, chemical, magnetic or electronic properties not found in ordinary materials.

nano-; → technology.

Naos (ζ Puppis)
  نایءوس   
Nâos

Fr.: Naos   

A bright, blue star of V = 2.25 in the constellation → Puppis. It is a hot → supergiant of type O5, with a → surface temperature of 42,000 K, lying 1,400 → light-years away. Naos is one of the rarest → O-type stars visible to the → naked eye.

Naos, from Gk. naos "ship," since it used to be the Zeta star of Argo Navis (Jason's vessel Argos) before becoming Zeta in Puppis.

Napierian logarithm
  لگاریتم ِ ناپیری   
logâritm-e Napieri (#)

Fr.: logarithme népérien   

Same as the → natural logarithm.

After John Laird Napier (1550-1617), the Scottish mathematician who invented logarithm; → logarithm.

narrow
  باریک   
bârik (#)

Fr.: étroit   

Of little breadth or → width.

M.E., from O.E. nearu; cf. O.S. naru "narrow," Du. naar "unpleasant;" akin to Ger. Narbe "scar," literally, "narrow mark."

Bârik, from Mid.Pers. bârîk "narrow," from O.Iranian *bāra-ya-ka-, from stem *bāra- "to cut;" cf. Av. bāra- "edge, blade," in tiži-bāra- "sharp-edged," from brī- "to cut, shave, shear;" cf. Skt. bhrī- "to hurt, injure," bhrinanti "they hurt;" O.C.S. briti "to shave;" PIE base *bhrē- "to cut, pierce."

narrow band
  باند ِ باریک، باریک‌باند   
bând-e bârik (#), bârik-bând (#)

Fr.: bande étroite   

Optics: Of a filter, same as → interference filter.
Radio.: Encompassing a small frequency range, typically less than 300 Hz.

narrow; → band.

narrow-band photometry
  شیدسنجی ِ باریک‌باند   
šidsanji-ye bârik bând

Fr.: photométrie à bande étroite   

Photometry using narrow-band filters to isolate a particular spectroscopic line or molecular band.

narrow band; → photometry.

narrow-line region
  ناحیه‌ی ِ باریک-خط   
nâhiye-ye bârik-xatt

Fr.: région à raies étroites   

The outer region of a → quasar or an → active galactic nucleus displaying narrow spectral lines. Also called Type II AGN. See also → obscuring torus.

narrow; → line; → region.

nasal
  دماغی   
damâqi (#)

Fr.: nasal   

1) Of, in, or relating to the → nose.
2) Phonetics: A → nasal consonant.

Adjective, from → nose.

nasal cavity
  کاواک ِ بینی، ~ دماغ   
kâvâk-e bini, ~ damâq

Fr.: cavité nasale   

The interior of the → nose. It is the structure which extends from the external opening, the → nostrils, to the → pharynx, where it joins the respiratory system.

nasal; → cavity.

nasal consonant
  هم‌آوای ِ دماغی   
hamâvâ-ye damâqi

Fr.: consonne nasale   

A consonant produced with air escaping through the → nose. For this to happen the → soft palate is lowered and at the same time the mouth passage blocked at some point, so that all the air is pushed out of the nose. Examples of this sound include the English sounds [m], [n], and [ng].

nasal; → consonant.

Nasireddin
  نصیر‌الدین   
Nasireddin

Fr.: Nasireddin   

A lunar → impact crater that is located in the southern part of the Moon's near side. Latitude: 41.0°S, longitude: 0.2°E, diameter: 52 km, depth: 3.35 km.

Named after the Iranian mathematician and astronomer Nasireddin Tusi (1201-1274), → Nasireddin couple.

Nasireddin couple
  جفت ِ نصیر‌الدین   
joft-e Nasireddin

Fr.: couple de Nasireddin   

A theorem put forward by the 13th century Persian mathematician and astronomer Nasireddin Tusi to generate linear motion from a combination of circular motions, and thus improve the geocentric model of Ptolemy. A circle of radius R rotates inside a circle of radius 2R. The smaller circle rotates at twice the speed of the larger one and in opposite direction. The initial tangent point will travel in linear motion back and forth along the diameter of the larger circle. A particular case of → hypocycloid curves.

Named for Nasireddin Tusi (1201-1274), director of Marâgha observatory who created the Ilkhani zij; → couple.

Nasmyth focus
  کانون ِ نسمیت   
kânun-e Nasmyth (#)

Fr.: foyer Nasmyth   

In an altazimuth-mounted telescope, a focal point to one side of the tube, created by placing a third deflecting mirror in the optical path. This extra mirror directs the beam along the altitude axis, and through a hole in the supporting trunnions. Nasmyth focus has the advantage of remaining at a fixed position relative to the telescope wherever the instrument is pointed. Moreover, bulky or heavy instruments can be mounted there on a permanent platform, which rotates only in azimuth.

Named after the inventor James Nasmyth (1808-1890), who first used it in the 19-th century.

nation
  نفان   
nafân

Fr.: nation   

A large body of people united by common descent, history, culture, or language, inhabiting a particular state. → national, → international.

Nation, from O.Fr. nacion, from L. nationem (nom. natio) "nation, stock, race," literally "that which has been born," from natus, p.p. of nasci "to be born;" cognate with Pers. zâdan, → generate.

Nafân, from Av. nāfaēna- "family," hama.nāfaēna- "of the same family," related to nāfa- "near relationship, family, navel," napāt- "grandson" (Mod.Pers. navé "grandson"); cf. Mid.Pers. nâf "family," nâfag "navel," naft "descendant, " Parthian nap "family" (Mod.Pers. nâf "navel"); Sogd. nâf "country;" Sorani Kurd. natawa (Kurmanji Kurd. netewe) "family, race, nation," from *nafata (with metathesis); cf. Skt. nábhi- "nave, navel, central part; home, origin;" Gk. anepsios "cousin, sister's son;" L. nepos "grandchild; descendant;" O.Lithuanian neputis "grandson; nephew;" O.H.G. nabalo "navel;" Ger. Nabel "navel;" O.E. nefa "grandson; descendant;" + -ân suffix denoting family relationship, as in Bâbakân "family of Bâbak."

national
  نفانی   
nafâni

Fr.: national   

Of, involving, or relating to a nation as a whole. → National Aeronautics and Space Administration (NASA).

nation; → -al.

<< < -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 > >>