Search Result for "mass number":
Wordnet 3.0

NOUN (1)

1. the sum of the number of neutrons and protons in an atomic nucleus;
[syn: mass number, nucleon number]



WordNet (r) 3.0 (2006):

mass number
    n 1: the sum of the number of neutrons and protons in an atomic
         nucleus [syn: mass number, nucleon number]