What is "spiral of archimedes"

Spiral \Spi"ral\, n. [Cf. F. spirale. See Spiral, a.]

1. (Geom.) A plane curve, not re["e]ntrant, 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.

   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.

n. (context mathematics English) A spiral that increases in distance from the point of origin at a constant rate.