3. (Alg.) Pertaining to terms of the second degree; as, a quadratic
equation, in which the highest power of the unknown quantity is a
square.
Quad*rat"ics (?), n. (Alg.) That branch of algebra which treats of
quadratic equations.
Quad*ra`to*ju"gal (?), a. (Anat.) (a) Of or pertaining to the quadrate
and jugal bones. (b) Of or pertaining to the quadratojugal bone. -- n.
The quadratojugal bone.
Quadratojugal bone (Anat.), a bone at the base of the lower jaw in many
animals.
Quad*ra"trix (?), n.; pl. -trixes (#), or -trices (#). [NL.] (Geom.) A
curve made use of in the quadrature of other curves; as the quadratrix,
of Dinostratus, or of Tschirnhausen.
Quad"ra*ture (?), n. [L. quadratura: cf. F. quadrature. See Quadrate,
a.] 1. (Math.) The act of squaring; the finding of a square having the
same area as some given curvilinear figure; as, the quadrature of a
circle; the operation of finding an expression for the area of a figure
bounded wholly or in part by a curved line, as by a curve, two
ordinates, and the axis of abscissas.