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“In optics, a deviation in the rays of light when unequally refracted by a lens or reflected by a mirror, so that they do not converge and meet in a point or focus, but separate, forming an indistinct image of the object, or an indistinct image with prismatically colored edges."-Wright, 1902


William Dwight Whitney, The Century Dictionary, an Encyclopedic Lexicon of the English Language (New York: The Century Co., 1902)I:10


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