Top, Help, Feedback, Customize Type in a word below to find its rhymes, synonyms, definitions, and more: Word:  Find rhymes Find synonyms Find antonyms Find definition Appears in definition of Find related words Find similar sounding words Find homophones Check spelling of word Match consonants only Match these letters Search in Shakespeare Search for quotations Organize results by: Syllables Letters     Include phrases: Yes No Rhymes   Synonyms   [Definitions]   Homophones   Similar sound   Same consonants   Related Definitions of atomic mass: noun:   (chemistry) the mass (in atomic mass units) of an isotope of an element Search for atomic mass at other dictionaries: OneLook, Answers.com, Merriam-Webster Search for atomic mass:    [Definition]   Quotes   Encyclopedia   Copyright © 2010 Datamuse