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2 definitions found
 for Conjugate diameters
From 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]

From 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]

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