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2017 Word of the Year

caustic surface

noun, 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 caustic.
Origin of caustic surface
1865-1870
First recorded in 1865-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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11
14
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