† central rulen.MathematicsObsoleterare a rule for determining the roots of polynomial equations, and for constructing such equations, by describing a circle of a certain radius which intersects a given parabola, the location of the centre of that circle determining the points of intersection.
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1684 T. BakerGeom. Key 6 So is it that, which this following Rule exactly performs, which for distinction-sake we may call the Central Rule, or Place.
1813 J. M. Good et al. Pantologia (at cited word) The central rule is founded on this property of the parabola.