Search Result for "absorption band":
Wordnet 3.0

NOUN (1)

1. a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths; 



WordNet (r) 3.0 (2006):

absorption band
    n 1: a dark band in the spectrum of white light that has been
         transmitted through a substance that exhibits absorption at
         selective wavelengths