WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / A / atomic mass unit atomic mass unit noun 4 syllables 16 letters Scrabble 20 WWF 25 Definitions noun unit of mass for expressing masses of atoms or molecules Look “atomic mass unit” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →