Know why cattywampus was trending last week?

extraordinary ray

noun, Optics, Crystallography
the part of a doubly refracted ray that has changed speed and vibrations in the principal plane of the crystal.
Origin of extraordinary ray
1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
British Dictionary definitions for extra ordinary ray

extraordinary ray

(optics) the plane-polarized ray of light that does not obey the laws of refraction in a doubly refracting crystal Compare double refraction, 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
Cite This Source

Word of the Day

Difficulty index for extraordinary ray

Few English speakers likely know this word

Word Value for extra

Scrabble Words With Friends