negative pedal[′neg·əd·iv ′ped·əl]
The negative pedal of a curve with respect to a point O is the envelope of the line drawn through a point P of the curve perpendicular to OP. Also known as first negative pedal.
Any curve that can be derived from a given curve by repeated application of the procedure specified in the first definition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.