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Dictionary

spi'ral of Archime'des

Geom.
a curve that is the locus of a point that moves outward with uniform speed along a vector, beginning at the origin, while the vector rotates about the origin with uniform angular velocity. Equation (in polar coordinates): r = a θ.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

spiral nebula

spiral spring

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