from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See mass number.
from the GNU version of the Collaborative International Dictionary of English
- n. The sum of the number of neutrons and protons in an atomic nucleus.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the sum of the number of neutrons and protons in an atomic nucleus
Sorry, no etymologies found.