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: 13176 Search : in
polarization angle
  زاویه‌ی ِ قطبش   
zâviye-ye qotbeš (#)

Fr.: angle de polarisation   

Same as → polarizing angle and → Brewster angle.

polarization; → angle.

polarization charge
  بارِ قطبش   
bâr-e qotbeš

Fr.:   

Same as → bound charge.

polarization; → charge.

polarization degree
  درجه‌ی ِ قطبش   
daraje-ye qotbeš (#)

Fr.: degré de polarisation   

degree of polarization.

polarization; → degree.

polarization fraction
  برخه‌ی ِ قطبش   
barxe-ye qotbeš

Fr.: fraction de polarisation   

The ratio expressed by P = (Ipar - Iper) / (Ipar + Iper), where Ipar and Iper are the light intensities with the electric field vector respectively parallel and perpendicular to the incident beam.

polarization; → fraction.

polarize
  قطبیدن   
qotbidan (#)

Fr.: polariser   

To cause → polarization. To undergo polarization.

Infinitive of → polarization.

polarized
  قطبیده   
qotbidé (#)

Fr.: polarisé   

Of or pertaining to a medium or physical phenomenon that exhibits → polarization.

P.p. of → polarize.

polarized light
  نور ِ قطبیده   
nur-e qotbidé (#)

Fr.: lumière polarisée   

Electromagnetic radiation in the optical region which has undergone → polarization.

Past participle of → polarize; → light.

polarizer
  قطبنده   
qotbandé (#)

Fr.: polariseur   

An optical device capable of transforming natural light into polarized light, usually by selective transmission of polarized rays.

Agent noun of → polarize.

polarizing angle
  زاویه‌ی ِ قطبش   
zâviye-ye qotbeš (#)

Fr.: angle de polarisation   

The angle of → incidence for which the reflected light is completely polarized. Also called the → Brewster angle and → polarization angle. See also → Brewster's law.

Polarizing, adj. of → polarize; → angle.

polarizing filter
  پالایه‌ی ِ قطبنده   
pâlâye-ye qotbandé (#)

Fr.: filtre polarisant   

A filter that polarizes light passing through it.

Polarizing, adj. of → polarize; → filter.

polarizing prism
  منشور ِ قطبنده   
manšur-e qotbandé

Fr.: prisme polarisant   

A prism that is used to produce or analyze plane-polarized light.

Polarizing, adj. of → polarize; → prism.

pole
  قطب   
qotb (#)

Fr.: pôle   

1) Either extremity of the axis of the Earth or of any spherical body.
2) Either of the two regions or parts of an electric battery, magnet, or the like, at which the magnetic flux density is concentrated.
3) → pole of a mirror.
4) The fixed point in a system of polar coordinates that serves as the origin.

M.E., from L. polus "end of an axis, the sky," from Gk. polos "pivot, pole," polein "move around;" from PIE base *kwel- "to turn, move around, sojourn, dwell;" cognate with Pers. carx "every thing performing a circulatory motion; a wheel; a cart;" Av. caxra- "wheel," caraiti "he moves, approaches;" cf. Skt. cakra- "wheel, circle; cycle," carati "he moves, wanders;" Gk. kyklos "circle, wheel" (loaned L.L. cyclus); L. colere "to dwell in, to cultivate, move around," colonus "farmer, settler;" O.E. hweol "wheel;" Rus. koleso "wheel."

Qotb, from Ar. quTb.

pole of a mirror
  قطب ِ آینه   
qotab-e âyene

Fr.: pôle de mirroir   

The point where the → principal axis passes through the mirror.

pole; → mirror.

pole star
  ستاره‌ی ِ قطبی   
setâre-ye qotbi (#)

Fr.: étoile polaire   

A star that lies along the Earth's → rotation axis. The term usually refers to the star → Polaris, which is the current → North Celestial Pole star. The → South Celestial Pole is not currently associated with any bright star. See also: → North Pole Star, → South Pole Star.

pole; → star.

polhode
  قطبراه   
qotbrâh

Fr.: polhodie   

Mechanics: For a rotating rigid body not subject to external torque, the closed curve described on the → inertia ellipsoid by the intersection with this ellipsoid of an axis parallel to the angular velocity vector and through the center.
Astro.: The path described by the North pole of the Earth in a reference frame attached to the Earth. The rotation axis of our planet is not fixed with respect to the Earth's crust. It describes a motion within a square with an amplitude reaching 20 m.

Polhode, from Fr. polhodie, coined by Louis Poinsot (1777-1859), a French mathematician and physicist, the inventor of geometrical mechanics, from → pole + Gk. hodos "way."

Qotbrâh, from gotb, → pole, + râh "way, path" (from Mid.Pers. râh, râs "way, street," also rah, ras "chariot;" from Proto-Iranian *rāθa-; cf. Av. raθa- "chariot;" Skt. rátha- "car, chariot," rathyā- "road;" L. rota "wheel," rotare "to revolve, roll;" Lith. ratas "wheel;" O.H.G. rad; Ger. Rad; Du. rad; O.Ir. roth; PIE *roto- "to run, to turn, to roll").

policy
  کاراه، کارراه   
kârâh, kârrâh

Fr.: 1) ligne d'action; 2) politique   

1) A definite course of action adopted for the sake of expediency, facility, etc.
2) A course of action adopted and pursued by a government, ruler, political party, etc. (Dictionary.com).

M.E. policie "government, civil administration," from O.Fr. policie "political organization, civil administration," from L.L. politia "the state, civil administration," from Gk. politeia "state, administration, government, citizenship," from polites "citizen," from polis "city, state."

Kârâh, contraction of kâr râh, or râh-e kâr literally "way of doing, ~ ~ action," from râh, → way, + kâr "doing, action, → work."

policy maker
  کاراه‌پرداز   
kârâh pardâz

Fr.: responsable politique, décideur   

A person responsible for making policy, especially in government (Dictionary.com).

policy; → make; → -er.

polish
  نسوکردن   
nasu kardan

Fr.: polir   

To make smooth and glossy by rubbing with something.

M.E. polishen, from O.Fr. poliss-, pr.p. stem of polir "to polish," from L. polire "to polish, make smooth," of unknown origin.

Nasu kardan (Dehxodâ) "to polish, smooth, brighten," from nasu "smooth, bright" (mirror, sword), Mid.Pers. Manichean Parthian nswg "tender," from Proto-Iranian *ni-sau-, from prefix ni- "down," → ni- (PIE), + *sau- "to rub;" cf. Mod.Pers. sâbidan, variants sâyidan, pasâvidan "to touch, to rub;" Khotanese sauy- "to rub;" Sogdian ps'w- "to touch."

polishing
  نسوکرد   
nasukard

Fr.: polissage   

A stage in the process of mirror making after grinding that puts a highly finished, smooth and apparently amorphous surface on a mirror. → figuring; → grinding.

Verbal noun of → polish.

politic
  کاراهی   
kârâhi

Fr.: politique   

1) Shrewd or prudent in practical matters; tactful; diplomatic.
2) Contrived in a shrewd and practical way.
3) Political (Dictionary.com).

M.E. politik, from M.Fr. politique "political," from L. politicus "of citizens or the state, civil, civic," from Gk. politikos "of citizens, pertaining to the state and its administrators," from polites "citizen," from polis "city."

Kârâhi, adj. of kârâh, → policy.

<< < -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 > >>