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: 12948 Search : far
objective probability
  شوانایی ِ بر‌آختی   
šavânâi-ye barâxti

Fr.: probabilité objective   

A probability determined by the long-term frequency of an event; in contrast to subjective probability.

objective; → probability.

objectivity
  بر‌آختیگی   
barâxtigi

Fr.: objectivité   

1) The state or quality of being → objective. Opposite of → subjectivity.
2) Ability to view things objectively.
3) External reality.

objective + → -ity.

oblate
  پخ   
pax (#)

Fr.: aplati   

Adjective meaning flattened, as → oblate spheroid. Opposed to → prolate.

From L. ob- "toward" + latus, abstracted from its opposite, prolatus "lengthened."

Pax "oblate," of unknown etymology.

oblate spheroid
  کره‌وار ِ پخ   
korevâr-e pax

Fr.: sphéroïde aplati   

An ellipsoid produced by rotating an ellipse through 360° about its minor axis. Compare with → prolate spheroid.

oblate; → spheroid.

oblateness
  پخی   
paxi (#)

Fr.: aplatissement   

The property possessed by a round body that is flattened at the poles.

Noun from → oblate.

obligate
  ۱) فریزیدن؛ ۲) فریزیده   
1) farizidan; 2) farizidé

Fr.: obliger   

1a) To bind or oblige morally or legally.
1b) To pledge, commit, or bind (funds, property, etc.) to meet an obligation.
2a) Morally or legally bound; obliged; constrained.
2b) Necessary; essential (Dictionary.com).

Back-formation from → obligation.

obligation
  فریز   
fariz (#)

Fr.: obligation   

1) Something by which a person is bound or obliged to do certain things, and which arises out of a sense of duty or results from custom, law, etc.
2) Something that is done or is to be done for such reasons (Dictionary.com).

M.E. obligacioun, from O.Fr. obligacion "obligation, duty, responsibility," from L. obligationem "an engaging or pledging," literally "a binding," noun of action from p.p. stem of obligare "to bind, bind up, bandage," from → ob- "to" + ligare "to bind," from PIE root *leig- "to bind."

Fariz, from Mid.Pers. frêz "obligation; duty."

obligatory
  فریزگون   
farizgun

Fr.: obligatoire   

Required as a matter of obligation; mandatory; incumbent; compulsory.

M.E., from L.L. obligatorius "binding," → obligate, + -tory, from L. -torius, from → -tor + -ius.

Farizgun, from fariz, → duty, + -gun "manner, fashion."

oblique
  یکور   
yekvar (#)

Fr.: oblique   

Neither perpendicular nor horizontal; having the axis not perpendicular to the base; slanting; sloping.

From M.Fr. oblique, from L. obliquus "slanting, sidelong, indirect," from ob "against" + root of licinus "(of an ox whose corn tips are) bent upward," from PIE base *lei- "to bend, be movable."

Yekvar, literally "slantingn to a side," from yek-, → one, + var "side," variant 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").

oblique rotator model
  مدل ِ چرخنده ِ یکور   
model-e carxande-ye yekvar

Fr.: modèle de rotateur oblique   

A stellar model in which the rotation axis is tilted relative to the magnetic dipole axis. As the star rotates, observable quantities (e.g. the line-of-sight component of the magnetic field, stellar brightness, emission lines) are modulated according to the rotational period. Such a model was first put forward by D. Stibbs (1950, MNRAS, 110, 395).

oblique; → rotator; → model.

oblique shock
  تش ِ یکور   
toš-e yekvar

Fr.: choc oblique   

A → shock wave that is inclined to the flow direction. Depending on the shape of the object and the speed of the → flow, the shock wave may be inclined to the flow direction.

oblique; → shock.

oblique sphere
  سپهر ِ یکور   
sepehr-e yekvar

Fr.: sphère oblique   

The celestial sphere when the circles parallel to the equator are cut obliquely by the horizon plane, which divides them into two unequal parts. In other words, the sphere when its axis is oblique to the horizon of the place.

oblique; → sphere.

obliquity
  یکوری   
yekvari

Fr.: obliquité   

1) General: The quality or state of being oblique.
2) The → angle that an object's → rotational axis makes with its → orbital axis. In other words, the angle between its → equatorial plane and → orbital plane. Same as → axial tilt.

State noun of → oblique.

obliquity of the ecliptic
  یکوری ِ هورپه   
yekvari-ye hurpeh

Fr.: obliquité de l'écliptique   

The angle between the Earth's → equatorial plane and the → ecliptic. Its present value is 23°26'13.5'' (or 23.43708 degrees). The effects of → precession and → nutation cause it to change between extreme values of 22.1 and 24.5 degrees over a period of approximately 41,000 years. It is currently decreasing.

obliquity; → ecliptic.

oblong
  درازک   
derâzak

Fr.: oblong   

Elongated, usually from the square or circular form.

Late M.E. oblonge, from L. oblongus "rather long," from ob- a prefix meaning "toward, to, on, over, against" + longus, → long.

Derâzak, from derâz "long," → length + -ak suffix.

OBN star
  ستاره‌ی ِ OBN   
setâre-ye OBN

Fr.: étoile OBN   

A → nitrogen (N)-rich → O-type or → B-type star.

O star; → B star; → nitrogen; → star.

obscurantism
  تاریک‌اندیشی، تاریک‌ورزی   
târikandiši, târikvarzi

Fr.: obscurantisme   

1) Opposition to the spread of knowledge; a policy of withholding knowledge from the general public.
2) A style (as in literature or art) characterized by deliberate vagueness or abstruseness (Merriam-Webster.com).

From Fr. obscurantisme (1819), from obscurant, from obscure, from L. obscurus "dark, dusky," figuratively "unknown; unintelligible," from ob- "over" + -scurus "covered," from PIE *(s)keu- "to cover, conceal;" → -ism.

obscuration
  تیره‌کرد، تیره‌شد   
tirekard, tirešod

Fr.: obscurcissement   

1) The act of obscuring.
2) The state of being obscured.

obscure; → -tion.

obscure
  ۱) تیره؛ ۲) تیره‌کردن   
1) tiré (#); 2) tiré kardan (#)

Fr.: 1) obscur; 2) obscurcir   

1a) Lacking in light or illumination; dark; dim; murky.
1b) Indistinct to the sight or any other sense.
1c) Not clear to the understanding.
2) To make dark, dim, indistinct, etc.

From O.Fr. obscur "dark, dim, not clear," from L. obscurus "covered over, dark, obscure," from ob "over" + -scurus "covered," from PIE *(s)keu- "to cover, conceal;" from which derives also the term → sky.

Tiré, from Mid.Pers. târag "dark, turbid," related to târik "dark," Mid.Pers. târig "dark," târ "darkness," Av. taθra- "darkness," taθrya- "dark," cf. Skt. támisrâ- "darkness, dark night," L. tenebrae "darkness," Hittite taš(u)uant- "blind," O.H.G. demar "twilight."
Tiré kardan compound verb with kardan "to do," → -ize.

obscuring torus
  چنبر ِ تیره‌ساز   
canbar-e tiresâz

Fr.: tore obscurcissant   

A structure of dust and gas postulated to surround the central → black hole in an → active galactic nucleus (AGN). The presence of an obscuring torus allows the unification of the two main types of AGNs containing a → broad-line region (Type I) and a → narrow-line region (Type II), respectively. In this unified model, the two types represent the same sort of object, the appearance of which depends on the viewer's → line of sight. The best evidence for this model comes from spectropolarimetry observations of some type II AGNs in which broad → emission lines are seen in → polarized light, as would happen if the broad-line region truly were hidden, and the light were being reflected off the torus and into the viewer's line of sight.

obscure; → torus.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men 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 oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>