from
The Collaborative International Dictionary of English v.0.48
Logarithmic \Log`a*rith"mic\, Logarithmical \Log`a*rith"mic*al\,
a. [Cf. F. logarithmique.]
1. Of or pertaining to logarithms; consisting of logarithms.
[1913 Webster]
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.
{Logarithmic spiral}, a spiral curve such that radii drawn
from its pole or eye at equal angles with each other are
in continual proportion. See {Spiral}.
[1913 Webster]
from
The Collaborative International Dictionary of English v.0.48
Spiral \Spi"ral\, n. [Cf. F. spirale. See {Spiral}, a.]
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}.
[1913 Webster]
2. Anything which has a spiral form, as a spiral shell.
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{Equiangular spiral},a plane curve which cuts all its
generatrices at the same angle. Same as {Logarithmic
spiral}, under {Logarithmic}.
{Spiral of Archimedes}, a spiral the law of which is that the
generatrix moves uniformly along the revolving line, which
also moves uniformly.
[1913 Webster]