# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 6 Search : hyperbolic
 hyperbolic   هذلولی   hozluli (#)Fr.: hyperbolique   Of or pertaining to a → hyperbola.From hyperbol-, → hyperbola, + → -ic. hyperbolic cosine   کوسینوس ِ هذلولی   kosinus-e hozluliFr.: cosinus hyperbolique   A function, denoted cosh x, defined for all real values of x, by the relation: cosh x = (1/2) (ex + e-x).→ hyperbolic; → cosine. hyperbolic function   کریایِ هذلولی   karyâ-ye hozluliFr.: fonction hyperbolique   Any of the six functions sinh, cosh, tanh, coth, csch, and sech that are related to the → hyperbola in the same way the → trigonometric functions relate to the → circle. Many of the formulae satisfied by the hyperbolic functions are similar to corresponding formulae for the trigonometric functions, except for + and - signs. For example: cosh2x - sinh2x = 1. See also: → hyperbolic cosine, → hyperbolic sine. Hyperbolic functions were first introduced by the Swiss mathematician Johann Heinrich Lambert (1728-1777).→ hyperbolic; → function. hyperbolic orbit   مدار ِ هذلولی   madâr-e hozluli (#)Fr.: orbite hyperbolique   An orbit that is an open curve whose ends get wider apart at any rate between that of an ellipse and a straight line. Some comets' orbits become hyperbolic through the gravitational influence of a planet the comet passes near.→ hyperbolic; → orbit. hyperbolic sine   سینوس ِ هذلولی   sinus-e hozluliFr.: sinus hyperbolique   A function, denoted cosh x, defined for all real values of x, by the relation: cosh x = (1/2) (ex - e-x).→ hyperbolic; → sine. hyperbolic space   فضای ِ هذلولی   fazâ-ye hozluli (#)Fr.: espace hyperbolique   A three-dimensional space whose geometry resembles that of a saddle-shaped surface and is said to have negative curvature.→ hyperbolic; → space.