Usually means: Sum of protons and neutrons.
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We found 8 dictionaries that define the word atomic mass number:

General (3 matching dictionaries)
  1. Atomic mass number: Wikipedia, the Free Encyclopedia
  2. Atomic mass number: TheFreeDictionary.com
  3. atomic mass number: Wiktionary

Computing (1 matching dictionary)
  1. Atomic mass number: Encyclopedia

Medicine (1 matching dictionary)
  1. Atomic mass number: Medical dictionary

Science (3 matching dictionaries)
  1. Atomic Mass Number: Eric Weisstein's World of Physics
  2. Illustrated Glossary of Geologic Terms (No longer online)
  3. Atomic Mass Number: Extragalactic Astronomy

Definitions from Wiktionary (atomic mass number)

noun:  (physics, physical chemistry, dated) Pedantic form of mass number. Symbol: A.

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