Search Result for "conjugate diameters":

The Collaborative International Dictionary of English v.0.48:

Conjugate \Con"ju*gate\, a. [L. conjugatus, p. p. or conjugare to unite; con- + jugare to join, yoke, marry, jugum yoke; akin to jungere to join. See Join.] 1. United in pairs; yoked together; coupled. [1913 Webster] 2. (Bot.) In single pairs; coupled. [1913 Webster] 3. (Chem.) Containing two or more compounds or radicals supposed to act the part of a single one. [R.] [1913 Webster] 4. (Gram.) Agreeing in derivation and radical signification; -- said of words. [1913 Webster] 5. (Math.) Presenting themselves simultaneously and having reciprocal properties; -- frequently used in pure and applied mathematics with reference to two quantities, points, lines, axes, curves, etc. [1913 Webster] Conjugate axis of a hyperbola (Math.), the line through the center of the curve, perpendicular to the line through the two foci. Conjugate diameters (Conic Sections), two diameters of an ellipse or hyperbola such that each bisects all chords drawn parallel to the other. Conjugate focus (Opt.) See under Focus. Conjugate mirrors (Optics), two mirrors so placed that rays from the focus of one are received at the focus of the other, especially two concave mirrors so placed that rays proceeding from the principal focus of one and reflected in a parallel beam are received upon the other and brought to the principal focus. Conjugate point (Geom.), an acnode. See Acnode, and Double point. Self-conjugate triangle (Conic Sections), a triangle each of whose vertices is the pole of the opposite side with reference to a conic. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Diameter \Di*am"e*ter\, n. [F. diam[`e]tre, L. diametros, fr. Gr. ?; dia` through + ? measure. See Meter.] 1. (Geom.) (a) Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve. (b) A diametral plane. [1913 Webster] 2. The length of a straight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock. [1913 Webster] Note: In an elongated object the diameter is usually taken at right angles to the longer axis. [1913 Webster] 3. (Arch.) The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module. [1913 Webster] Conjugate diameters. See under Conjugate. [1913 Webster]