MASS DEFECT

I. (noun)

Meaning:

The amount by which the mass of an atomic nucleus is less than the sum of the masses of its constituent particles

Synonyms:

mass defect; mass deficiency

Classified under:

Nouns denoting natural phenomena

Hypernyms ("mass defect" is a kind of...):

mass (the property of a body that causes it to have weight in a gravitational field)