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Meaning of diacaustic

di•a•caus•tic

Pronunciation: (dī'u-kô'stik), [key]
— Math., Math.,Optics.
—adj.
  1. noting a caustic surface or curve formed by the refraction of light.
—n.
  1. a diacaustic surface or curve. Cf. catacaustic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.