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Fr.: prisme polarisant
A prism that is used to produce or analyze plane-polarized light.
1) Either extremity of the axis of the Earth or of any spherical body.
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
Fr.: pôle de mirroir
The point where the → principal axis passes through the mirror.
setâre-ye qotbi (#)
Fr.: étoile polaire
A star that lies in the direction pointed to by 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 associated with any bright star.
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.
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").
Fr.: 1) ligne d'action; 2) politique
1) A definite course of action adopted for the sake of expediency, facility, etc.
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."
Fr.: responsable politique, décideur
A person responsible for making policy, especially in government (Dictionary.com).
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."
Verbal noun of → polish.
1) Shrewd or prudent in practical matters; tactful; diplomatic.
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.
Of, pertaining to, or concerned with → politics.
Fr.: spécialiste en sciences politiques
A person who studies the structure and theory of government and seeks practical and theoretical solutions to political problems.
1) A person who is active in party politics.
From politic + -ian an agent noun suffix.
Powdery grains that contain the male reproductive cells of most plants (Dictionary.com).
From L. pollen "mill dust; fine flour," related to polenta "peeled barley," and probably to Gk. poltos "pap, porridge."
Gardé, from gard "powder, dust."
The introduction of harmful substances or light into the natural environment
as a consequence of human activities. → light pollution.
M.E., from O.Fr., from L.L. pollutionem "defilement," from L. polluere "to soil, defile," from pol-, variant of por- "forth, forward, before" + -luere "smear," related to lutum "mud," and to lues "filth; plague, pestilence;;" cf. Gk. luma "filth, dirt, disgrace;" O.Ir. loth "mud, dirt;" Lith. lutynas "pool, puddle;" Pers. âludan, as below.
&ACIRC;ludegi, from âludan, âlây-"to pollute, soil, stain;" Mid.Pers. âlutan; from prefixed Proto-Iranian *ā-rūta-, from rav- "to stain, soil;" Mid.Pers. Manichean Parthian rwd "rascal;" PIE base *leu- "dirty; to soil;" cf. L. lues, as above.
Pollux (β Geminorum)
The brightest star in the constellation → Gemini despite its designation as β. Also known as HR 2990 and HD 62509. Pollux lies about 4 degrees apart from the blue star → Castor with which it has no physical connection. Pollux is an orange-red star with a → visual magnitude 1.14 (B - V = +1.00) located about 34 → light-years away. It is a → giant star of → spectral type K0 III, with a mass of 2 Msun, a radius of about 10Rsun, a luminosity of 43 Lsun, and an → effective temperature of 4666 K. Pollux has a large planet, → Pollux b, with a mass of at least 2.3 times the mass of Jupiter.
Pollux, Gk. Polydeucus is one of the "Heavenly Twins," brother to → Castor, sons of Leda and Zeus.
Pollux, loan from L., as above. It has a too long Ar. name:
Fr.: Pollux b
An → extrasolar planet orbiting the bright star → Pollux (β Gem). It lies approximately 34 → light-years away in the constellation → Gemini. Called also → Thestias, it has a mass of at least 2.30 → Jupiter mass, and orbits Pollux at a distance of about 1.64 → astronomical units once every 590 days.
poloidal magnetic field
meydân-e meqnâtisi-ye qotbivâr
Fr.: champ magnétique poloïdal
1) In → protoplanetary disk models, the magnetic field
whose large-scale lines of force depart away from the → accretion disk,
in the direction of the rotation axis.
A radioactive chemical element; symbol Po. Atomic number 84; mass number of most stable isotope 209; melting point 254°C; boiling point 962°C.
The name derives from Poland, the native country of Marie Sklodowska Curie. It was discovered by Pierre and Marie Curie in 1898, from its radioactivity.