Source : Webster's Revised Unabridged Dictionary (1913)

Catacaustic \Cat`a*caus"tic\, a. [Pref. cata + caustic.]
   (Physics)
   Relating to, or having the properties of, a caustic curve
   formed by reflection. See {Caustic}, a. --Nichol.

Catacaustic \Cat`a*caus"tic\, n. (Physics)
   A caustic curve formed by reflection of light. --Nichol.