polar-reciprocal curves

polar-reciprocal curves

[¦pō·lər ri‚sip·rə·kəl ′kərvz]
(mathematics)
Two curves configured so that the polar of every point of one of them, with respect to a particular conic, is tangent to the other curve.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.