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#top Logarithmic Spiral

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Logarithmic \Log'a*rith"mic\, Logarithmical \Log'a*rith"mic*al\, a. [Cf. F. logarithmique.]

1. Of or pertaining to logarithms; consisting of logarithms.

2. Using logarithms; as, logarithmic graph paper; a logarithmic scale. [PJC]

3. Having a logarithm in one or more of the unknowns; -- of an equation. [PJC]

{Logarithmic curve} (Math.), a curve which, referred to a system of rectangular coordinate axes, is such that the ordinate of any point will be the logarithm of its abscissa.

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Spiral \Spi"ral\, noun [Cf. F. spirale. See {Spiral}, adjective]

1. (Geom.) A plane curve, not reentrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point called the pole. Cf. {Helix}.

2. Anything which has a spiral form, as a spiral shell.

{Spiral of Archimedes}, a spiral the law of which is that the generatrix moves uniformly along the revolving line, which also moves uniformly.