Optics, Crystallography. the part of a doubly refracted ray whose velocity within a crystal is the same in any direction.
What Is Phonetic Spelling?Spelling is how we put words together, but what is phonetic spelling? An alternate way to create words? Well, yes!
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British Dictionary definitions for ordinary ray
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