an optical spectrum consisting of groups of closely spaced spectral lines, characteristic of molecules.
Origin of band spectrum
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for band spectrum
a spectrum consisting of a number of bands of closely spaced lines that are associated with emission or absorption of radiation by molecules
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012