Meaning of Lissajous figure

Lis'sa•jous fig"ure

Pronunciation: (lē'su-zh", lē"su-zh'), [key]
— Physics. Physics.
  1. the series of plane curves traced by an object executing two mutually perpendicular harmonic motions.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.