cissoid of Diocles
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cissoid of Diocles[′si‚sȯid əv ′dī·ə·klēz]
The cissoid of a circle and a tangent line with respect to a fixed point on the circumference of the circle diametrically opposite the point of tangency.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.