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Related to Caustic surface: Caustic curve
|(Optics)||a surface to which rays reflected or refracted by another surface are tangents. Caustic curves and surfaces are called catacaustic when formed by reflection, and diacaustic when formed by refraction.|
|etc. See under Caustic, Heating, etc.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.