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Dictionary

diffrac'tion grat"ing

Physics.
a band of equidistant, parallel lines, usually more than 5000 per inch (2000 per centimeter), ruled on a glass or polished metal surface for diffracting light to produce optical spectra. Also called grating.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

diffraction

diffractive

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