WordReference Random House Unabridged Dictionary of American English © 2026
diffrac′tion grat′ing, [Physics.]
- Physicsa 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.
- 1865–70
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'diffraction grating' also found in these entries (note: many are not synonyms or translations):
