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mass defect

noun, Physics.
the amount by which the mass of an atomic nucleus differs from the sum of the masses of its constituent particles, being the mass equivalent of the energy released in the formation of the nucleus.
Compare binding energy.
Origin of mass defect
First recorded in 1925-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for mass defect

mass defect

(physics) the amount by which the mass of a particular nucleus is less than the total mass of its constituent particles See also binding energy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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