s/n3263474

Information
has gloss	(noun) a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset echelon
lexicalization	eng: echelon
subclass of	(noun) optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum grating, diffraction grating