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relative atomic mass

noun
1.
the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12 Ar, r.a.m. Former name atomic weight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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relative atomic mass in Science
relative atomic mass
  (rěl'ə-tĭv)   
See atomic weight.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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