English definition of Polar

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Definition of polar

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Polar (n.) The right line drawn through the two points of contact of the two tangents drawn from a given point to a given conic section. The given point is called the pole of the line. If the given point lies within the curve so that the two tangents become imaginary, there is still a real polar line which does not meet the curve, but which possesses other properties of the polar. Thus the focus and directrix are pole and polar. There are also poles and polar curves to curves of higher degree th

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Circumpolar :: Circumpolar (a.) About the pole; -- applied to stars that revolve around the pole without setting; as, circumpolar stars..

Dextrin :: Dextrin (n.) A translucent, gummy, amorphous substance, nearly tasteless and odorless, used as a substitute for gum, for sizing, etc., and obtained from starch by the action of heat, acids, or diastase. It is of somewhat variable composition, containing several carbohydrates which change easily to their respective varieties of sugar. It is so named from its rotating the plane of polarization to the right; -- called also British gum, Alsace gum, gommelin, leiocome, etc. See Achroodextrin, and Ery

Saccharimetry :: Saccharimetry (n.) The act, process or method of determining the amount and kind of sugar present in sirup, molasses, and the like, especially by the employment of polarizing apparatus..

Polarity :: Polarity (n.) A property of the conic sections by virtue of which a given point determines a corresponding right line and a given right line determines a corresponding point. See Polar, n..

Cronian :: Cronian (a.) Saturnian; -- applied to the North Polar Sea.

Iceland Spar :: Iceland spar () A transparent variety of calcite, the best of which is obtained in Iceland. It is used for the prisms of the polariscope, because of its strong double refraction. Cf. Calcite..

Lodestone :: Lodestone (n.) A piece of magnetic iron ore possessing polarity like a magnetic needle. See Magnetite.

Depolarization :: Depolarization (n.) The act of depriving of polarity, or the result of such action; reduction to an unpolarized condition..

Lituus :: Lituus (n.) A spiral whose polar equation is r2/ = a; that is, a curve the square of whose radius vector varies inversely as the angle which the radius vector makes with a given line..

Astatic :: Astatic (a.) Having little or no tendency to take a fixed or definite position or direction: thus, a suspended magnetic needle, when rendered astatic, loses its polarity, or tendency to point in a given direction..

Polar :: Polar (a.) Of or pertaining to the magnetic pole, or to the point to which the magnetic needle is directed..

Gyroidal :: Gyroidal (a.) Turning the plane of polarization circularly or spirally to the right or left.

Isotropy :: Isotropy (n.) Uniformity of physical properties in all directions in a body; absence of all kinds of polarity; specifically, equal elasticity in all directions..

Mad :: Mad (superl.) Having impaired polarity; -- applied to a compass needle.

Herapathite :: Herapathite (n.) The sulphate of iodoquinine, a substance crystallizing in thin plates remarkable for their effects in polarizing light..

Inducteous :: Inducteous (a.) Rendered electro-polar by induction, or brought into the opposite electrical state by the influence of inductive bodies..

Polarized :: Polarized (imp. & p. p.) of Polariz.

Inactive :: Inactive (a.) Not active; inert; esp., not exhibiting any action or activity on polarized light; optically neutral; -- said of isomeric forms of certain substances, in distinction from other forms which are optically active; as, racemic acid is an inactive tartaric acid..

Cynosure :: Cynosure (n.) The constellation of the Lesser Bear, to which, as containing the polar star, the eyes of mariners and travelers were often directed..

Unipolar :: Unipolar (a.) Having but one pole or process; -- applied to those ganglionic nerve cells which have but one radiating process; -- opposed to multipolar.