mass spectra

mass spectrum

noun Physics.
a spectrum of charged particles, arranged in order of mass or mass-to-charge ratios.

Origin:
1915–20

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
mass spectrum

noun
a distribution of ions as shown by a mass spectrograph or a mass spectrometer 
WordNet® 3.0, © 2006 by Princeton University.
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