spiral of Archimedes
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spiral of Archimedes[¦spī·rəl əv ‚är·kə′mē·dēz]
The curve spiraling into the origin which in polar coordinates is given by the equation r = a θ. Also known as Archimedes' spiral.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.