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2017 Word of the Year

reflection plane

noun, Crystallography.
1.
a plane through a crystal that divides the crystal into two halves that are mirror images of each other.
Also called symmetry plane.
Compare symmetry element.
Origin of reflection plane
1970-1975
First recorded in 1970-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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15
18
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