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3. A table for facilitating reference to topics, names, and the like, in a book; -- usually alphabetical in arrangement, and printed at the end of the volume. 4. A prologue indicating what follows. [Obs.] --Shak. 5. (Anat.) The second digit, that next pollex, in the manus, or hand; the forefinger; index finger. 6. (Math.) The figure or letter which shows the power or root of a quantity; the exponent. [In this sense the plural is always indices.] Index error, the error in the reading of a mathematical instrument arising from the zero of the index not being in complete adjustment with that of the limb, or with its theoretically perfect position in the instrument; a correction to be applied to the instrument readings equal to the error of the zero adjustment. Index expurgatorius. [L.] See Index prohibitorius (below). Index finger. See Index, 5. Index glass, the mirror on the index of a quadrant, sextant, etc. Index hand, the pointer or hand of a clock, watch, or other registering machine; a hand that points to something. Index of a logarithm (Math.), the integral part of the logarithm, and always one less than the number of integral figures in the given number. It is also called the characteristic. Index of refraction, or Refractive index (Opt.), the number which expresses the ratio of the sine of the angle of incidence to the sine of the angle of refraction. Thus the index of refraction for sulphur is 2, because, when light passes out of air into sulphur, the sine of the angle of incidence is double the sine of the angle of refraction. Index plate, a graduated circular plate, or one with circular rows of holes differently spaced; used in machines for graduating circles, cutting gear teeth, etc. Index prohibitorius [L.], or Prohibitory index (R. C. Ch.), a catalogue of books which are forbidden by the church to be read; the index expurgatorius [L.], or expurgatory index, is a catalogue of books from which passages marked as against faith or morals must be removed before Catholics can read them. These catalogues are published with additions, from time to time, by the Congregation of the Index, composed of cardinals, theologians, etc., under the sanction of the pope. --Hook. Index rerum [L.], a tabulated and alphabetized notebook, for systematic preservation of items, quotations, etc., Characteristic Char`ac*ter*is"tic, n. 1. A distinguishing trait, quality, or property; an element of character; that which characterized. --Pope. The characteristics of a true critic. --Johnson. 2. (Math.) The integral part (whether positive or negative) of a logarithm.

- characteristic (from the greek word for a property or attribute ( trait ) of an entity ) may refer to: any characteristic curve that shows

- in mathematics , the characteristic of a ring r, often denoted char(r), is defined to be the smallest number of times one must use the

- a light characteristic is a graphic and text description of a navigational light sequence or colour displayed on a nautical chart or in a

- in linear algebra , every square matrix is associated with a characteristic polynomial. this polynomial encodes several important

- file:caprella_mutica_male_morphology. jpg , morphology of a male caprella mutica morphology is a branch of biology dealing with the study

- a medical sign is an objective indication of some medical fact or characteristic that may be detected by a physician during a physical

- the characteristic impedance or surge impedance of a uniform transmission line , usually written z 0, is the ratio of the amplitudes of

- date february 2009 file:giovanni paolo pannini 002. jpg , roman ruins with a prophet, by giovanni pannini , 1751. the artistic cultural

- in mathematics , the method of characteristics is a technique for solving partial differential equations . of characteristics is valid for

- the common characteristic to these is that a measurement of angular motion is combined with a measurement of the absolute velocity

- in mathematics , the characteristic of a ring r, often denoted char(r), is defined to be the smallest number of times one must use the

- a light characteristic is a graphic and text description of a navigational light sequence or colour displayed on a nautical chart or in a

- in linear algebra , every square matrix is associated with a characteristic polynomial. this polynomial encodes several important

- file:caprella_mutica_male_morphology. jpg , morphology of a male caprella mutica morphology is a branch of biology dealing with the study

- a medical sign is an objective indication of some medical fact or characteristic that may be detected by a physician during a physical

- the characteristic impedance or surge impedance of a uniform transmission line , usually written z 0, is the ratio of the amplitudes of

- date february 2009 file:giovanni paolo pannini 002. jpg , roman ruins with a prophet, by giovanni pannini , 1751. the artistic cultural

- in mathematics , the method of characteristics is a technique for solving partial differential equations . of characteristics is valid for

- the common characteristic to these is that a measurement of angular motion is combined with a measurement of the absolute velocity