回かい折せつ格こう子しかいせつこうしMeanings1noundiffraction gratingTechnical term in optics; a device that splits light into its component wavelengths.回かい折せつ格こう子しを使つかって光ひかりのスペクトルを観かん察さつした。We observed the spectrum of light using a diffraction grating.
