a spiral curve such that radii drawn from its pole or eye at equal angles with each other are in continual proportion. See Spiral.
See also: Logarithmic
logarithmic spiral
logarithmic spiral
[′läg·ə‚rith·mik ′spī·rəl] (mathematics) The spiral plane curve whose points in polar coordinates (r,θ) satisfy the equation log r = a θ. Also known as equiangular spiral.