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: 13009 Search : far
oceanic
  اقیانوسی   
oqyânusi (#)

Fr.: océanique   

Of, living in, or produced by the ocean.

ocean; → -ic.

oceanic crust
  پوسته‌ی ِ اقیانوسی   
puste-ye oqyânusi

Fr.: croûte océanique   

That part of the → Earth's crust underling most of the Earth's surface which is covered by the oceans. It has a remarkably uniform composition (mostly ~ 49% SiO2) and thickness (mostly ~ 7 km). The ocean floor is the most dynamic part of the Earth's surface. As a result, no part of the oceanic crust existing today is more than 200 million years old, which is less than 5% of the age of the Earth itself. New oceanic crust is constantly being generated from the → upper mantle by sea-floor spreading at → mid-ocean ridges, while other parts of the oceanic crust are being recycled back into the mantle at subduction zones.

oceanic; → crust.

oceanic ridge
  روک ِ اقیانوسی   
ruk-e oqyânusi

Fr.: dorsale océanique   

Any section of the narrow, continuous submarine mountain chain through all the world's oceans. The oceanic ridge constitutes the most extensive mountain ridge on Earth, more than 65,000 km. Perhaps the best-known part of the ridge system is the → Mid-Atlantic Ridge.

oceanic; → ridge.

oceanography
  اقیانوس‌شناسی   
oqyânus-šenâsi (#)

Fr.: océanographie   

The study of the ocean, embracing and integrating all knowledge pertaining to the ocean's physical boundaries, the chemistry and physics of sea water, and marine biology.

ocean + → -graphy.

Oqyânusocean + -šenâsi-logy.

ochre
  اخرا   
oxrâ (#)

Fr.: ocre   

Any of various natural clays rich in ferric oxides (Fe2O3) and containing silica and alumina. Used as a red (→ hematite) or yellow (→ limonite) pigment.

M.E. oker, O.Fr. ocre, from L. ochra, from Gk. okhra, from okhros "pale yellow."

Oxrâ, loan from Gk.

Ockham's razor
  اُستره‌ی ِ آکم   
ostare-ye Ockham (#)

Fr.: rasoir d'Ockham   

The notion that any hypothesis should be stripped of all unnecessary assumptions. If two hypotheses fit the observations equally well, the one that makes the fewest assumptions should be chosen.

The doctrine was formulated by William of Ockham (c.1288-c.1347), an English Franciscan friar and scholastic philosopher. Razor from O.Fr. rasour "a razor," from raser "to scrape, shave."

Ostaré "razor," from sotordan "to shave, erase, remove;" Mid.Pers. ôstarak "removed, shaved," ôstârišn "wiping, shaving;" cf. Khotanese ustar- "to remove," Sogdian (prefixed *pari-) prtr- "to wipe off, dry up," from Proto-Iranian *us-tar- "to remove, wipe off."

octa-, oct-
  هشت-، اکتا-، اکت-   
hašt-, octa-, oct-

Fr.: octa-, octo-, oct-   

A prefix meaning eight.

From L. octo, Gk. okto, cognate with Pers. hašt, as below. Skt. asta, Goth. ahtau, O.E. eahta (see eight).

Hašt "eight," from Mid.Pers. hašt, O.Pers.*aštahva- "eighth;" Av. ašta; cf. Skt. astā; Ossetic ast; (Buddhist) Sogdian 'št; Gk. okto, L. octo (Fr. huit; Sp. ocho); P.Gmc. *akhto(u) (O.E. eahta, æhta, E. eight, O.N. atta, Ger. acht, Goth. ahtau); PIE base *oktô(u).
Octa-, oct, loaned Gk. forms, as above.

octad
  اکتاد   
oktâd

Fr.: octade   

A group of eight units or figures.
Chemistry: An element, atom, or group having a valence of eight.

From Gk. oktad- (stem oktás) "group of eight," from okt-oct- + -ad a prefix denoting a group or unit comprising a certain number, sometimes of years (e.g. dyad; triad).

octagon
  هشت‌بر، هشت‌گوش   
haštbar, haštguš (#)

Fr.: octogone   

A polygon having eight angles and eight sides.

From L. octagonos, from Gk. oktagononos "eight-angled," from okta-, → octa-, oct- "eight," + gonia "angle," related to gony "knee," L. genu "knee," cuneus "a wedge;" Av. žnu- "knee;" Mod.Pers. zânu "knee," Skt. janu- "knee," kona- "angle, corner;" PIE base *g(e)neu-, see below.

Haštbar "eight-sided," from hašt "eight," → octa-, oct- + bar "side; breadth; breast" (Mid.Pers. var "breast;" Av. vouru "wide, broad, extended" (vourucašāni- "looking far"), related to varah- "breast;" cf. Skt. urú- "wide, broad," úras- "breast;" Gk. eurus "wide, broad;" PIE base uer-, ueru-s"wide, broad"); haštguš, from hašt, → octa-, oct-, + guš "corner, angle," Mid.Pers. gošak "corner."

octahedron
  هشتدیمه   
haštdimé

Fr.: octaèdre   

A geometric solid with eight sides.

octa-, oct-; → -hedron.

Octans
  هشتکان   
Haštakân (#)

Fr.: Octant   

The Octant. A faint and obscure constellation, at 21h right ascension, 80° south declination, containing the south celestial pole. Its star Sigma Octantis is the closest naked-eye star to the pole, but it is so faint (magnitude 5.47) that it is practically useless as a polar star for navigation purposes. Abbreviation: Oct; Genitive: Octantis. It was introduced by the French astronomer Nicolas Louis de Lacaille (1713-1762).

From L.L. octans "eighth part of a circle," from → octa-, oct- + -ans, as in quadrans; → quadrant.

Haštakân, → octant.

octant
  هشتکان   
haštakân (#)

Fr.: octant   

1) A portion of a circle cut off by an arc and two radii at 45°, one-eighth of the area of a circle.
2) A instrument incorporating a telescope, the predecessor of the → sextant, used to measure angular distances, mainly in nautical astronomy. It spanned an angular range of 45°.

From L.L. octans "eighth part of a circle," from → octa-, oct- + -ans, as in quadrans; → quadrant.

Haštakân, from haštak "one-eigth," from hašt "eight" (Mid.Pers. hašt, O.Pers.*aštahva- "eighth;" Av. ašta; cf. Skt. astā; Ossetic ast; (Buddhist) Sogdian 'št; Gk. okto, L. octo (Fr. huit; Sp. ocho); P.Gmc. *akhto(u) (O.E. eahta, æhta, E. eight, O.N. atta, Ger. acht, Goth. ahtau); PIE base *oktô(u) + -ak, contraction of yak "one," (Mid.Pers. êwak (Proto-Iranian *aiua-ka-); O.Pers. aiva- "one, alone;" Av. aēuua- "one, alone" (cf. Skt. éka- "one, alone, single;" Gk. oios "alone, lonely;" L. unus "one;" E. one) + -ân nuance suffix.

octave
  اکتاو   
octâv (#)

Fr.: octave   

The interval between two musical notes, the fundamental components of which have frequencies in the ratio two to one.

M.E., from O.Fr. otaves, from L. octava feminine of octavus, from → octa-, oct- + -avus adj. suffix.

Octâv, loan from Fr. as above.

octet
  هشتایه   
haštâyé

Fr.: octet   

General: A group or series of eight.
Chemistry: A stable group of eight electrons which constitutes the outer electron shell of an atom of an inert gas (except helium whose only electron shell contains two electrons).

From → oct-, octa- + -et, as in duet.

Haštâyé, from haštâ "eightfold" + (y)é nuance suffix, as in dotâyé, → doublet.

octuple
  هشتایی   
haštâyi (#)

Fr.: octuple   

Eightfold; eight times as great.

L. octuplus, from octu- variant (before labials) of → oct- octa- + -plus "fold," from base of plicare "to fold, twist."

Haštâyi, from hašt "eight," → oct- octa- + -tâyi, from "fold, plait, ply; piece, part," also a multiplicative suffix; Mid.Pers. tâg "piece, part."

octupole
  هشت‌قطبه   
haštqotbé

Fr.: octupôle   

A → multipole consisting of eight point charges. Octupole moments are much smaller than → quadrupole moments and very much smaller than → dipole moment.

oct-; → pole.

ocular
  چشمی، دیدگانی   
cašmi, didgâni

Fr.: oculaire   

1) Of, pertaining to, or for the eyes.
2) Optics: An alternative term for → eyepiece.

From L. ocularis "of the eyes," from oculus "eye," from PIE base *okw- "to see;" cf; Av. aši- "(both) eyes;" E. → eye.

Cašmi, related to cašm "eye" (Mid.Pers. cašm, Av. cašman- "eye," ākas- "to look," from prefix ā- + Proto-Iranian *kas- "to look, appear," cf. Skt. cáksus- "seeing"); didgâni, related to didgân "eyes," plural of didé "eye," from didan "to see" (Mid.Pers. ditan "to see, regard, catch sight of, contemplate, experience;" O.Pers. dī- "to see;" Av. dā(y)- "to see," didāti "sees;" cf. Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen").

odd
  تاق   
tâq

Fr.: impair   

Of a number, not divisible by two.
A function such as f(x) with the property that f(-x) = - f(x) for any value of x; e.g. sin(x).

From M.E. odde, from O.N. oddi "odd (number)."

Tâq, related to tak "single, alone", from Mid.Pers. tak, tâg "single, alone," maybe related to tâi, tâ "unit, piece."

odd-even nucleus
  هسته‌ی ِ تاق-جفت   
haste-ye tâq-joft

Fr.: noyau impair-pair   

Nucleus which contains an odd number of protons and an even number of neutrons.

odd; → even; → nucleus.

odd-odd nucleus
  هسته‌ی ِ تاق-تاق   
haste-ye tâq-tâq

Fr.: noyau impair-impair   

Nucleus which contains an odd number of both protons and neutrons.

odd; → nucleus.

<< < -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 awa azi bac bal Bar Bar Bay bea Bep Bet BIC bij bin bio bir bla bla blu blu bol Boo bou Bq bre bri bub B[e cal cal can car car Cas cat cau cel cen Cer cha cha cha che chi CI cir cir cla cle clo clu co- cob 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 cov cra cri cro cry cum cur cyc d'A dar dat DC dea dec dec dec def def deh Del den dep des det deu dia dif dif dif dim dip Dir dis dis dis dis dis div dom dos dou dri Dum dus dyn dyn ear eas ecl Edd eff Ein eje ele ele ele ele eli emb emi Enc ene ens eph epo equ equ eru eth Eul eve evo exc exc exi exo exp exp ext ext Fab fai Fan fea fem fer fie fil fir fir fla flo flu foc For for fos fra fre fre fro fun g m Gal gal gal gas gau gel gen geo geo geo gho gla gno gra gra gra gra Gre Gre gro gyr had hal har Har HD hea hel hel Her Her Hic hig hip hol hor hos hov Hub hun hyd hyd Hyd hyp IC ide ill ima imp imp inc inc ind ind inf inf inf inf inj ins ins int int int int int int int int inv inv ion iro Isl iso iso Jac jet jud jur kel Kep kil Kle 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 Mei Mer Mer met met Met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per pet pha Pho pho pho pho Pic Pis Pla pla pla pla Ple poa pol pol pol pol pop pos pos pow pra pre pre pre pri pri pri pro pro pro pro pro pro pro Pto pul puz 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 rep res res res res ret Rhe rid rig ris Roe Ros rot rub rut Sag sam sat sca sca Sch sci sea sec sec see sel sem sen ser Sgr sha shi sho sid sig sim sin Sir ske sli smo soc sol sol sol sol sol sou sou spa spe spe spe spe sph spi spl spu sta sta sta sta sta ste ste sti sto str Str sub sub sub sul sup sup sup sup sur sus sym syn sys Tam Tay tel ten Ter Tha the the the thi thr tib tid tim tok Tor tot tra tra tra tra Tri tri tro tru tur twi Typ ufo ult unc uni uni uni upl ura uti val var vec vel ver ver vil vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yea You zer zod > >>