~ 1
■ adjective
1》 sounding harsh and unpleasant.
2》 causing irritation.
Derivatives
~ly adverb
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~ 2
■ noun
1》 a framework of parallel or crossed bars, typically preventing access through an opening.
2》 (also diffraction ~ ) Optics a set of equally spaced parallel wires or ruled lines, used to produce spectra by diffraction.