noun Optics, Crystallography.
the part of a doubly refracted ray that has changed speed and vibrations in the principal plane of the crystal.
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Origin of extraordinary ray
First recorded in 1870–75
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012