One of the mysteries of the English language finally explained.
A curve whose ordinate represents the area under another curve; specifically that attributed to Hippias (5th cent. b.c.) in his attempt to trisect an angle, having the formula y = x cotπx/2a (in polar coordinates r = 2aθ/π sin θ).
Mid 17th century. From post-classical Latin quadratrix from classical Latin quadrāt-, past participial stem of quadrāre + -trīx.
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