Definition of "mass spectrum" []

• A band of charged particles of different masses formed when a beam of ions is passed through the deflecting fields of a mass spectroscope, from which the masses of atoms, molecules, or isotopes can be determined. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.