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Webster's 1828 Dictionary

QUADRATRIX

n. 1. A square or squared figure.
2. In geometry, a mechanical line by means of which we can find right lines equal to the circumference of circles or other curves and their several parts.

 

Webster's 1913 Dictionary

QUADRATRIX

Quad *ra "trix, n.; pl. -trixes, or -trices. Etym: [NL. ] (Geom.)

 

Defn: A curve made use of in the quadrature of other curves; as the quadratrix, of Dinostratus, or of Tschirnhausen.