what does diffraction grating mean?

DIFFRACTION GRATING as NOUN

Meaning
- 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
Synonym(s)
- grating (what does grating mean?)
Hypernyms(s) diffraction grating is a kind of… Example: animal is a hypernym of mammal, plant is a hypernym of flower
- optical device (what does optical device mean?)
Hyponym(s)
- echelon (what does echelon mean?)