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|(Physics)||A surface of simultaneous and equal displacement of the particles composing a wave of vibration.|
|(Geom.)||A mathematical surface of the fourth order which, upon certain hypotheses, is the locus of a wave surface of light in the interior of crystals. It is used in explaining the phenomena of double refraction. See under Refraction.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.