caustic surface: Meaning and Definition of

caus'tic sur'face

Pronunciation: [key]
— Optics. Optics.
  1. the surface to which all light rays emanating from a single point and reflected by a curved surface, as a concave mirror, are tangent. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.