WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / D / disk operating system disk operating system noun 21 letters Scrabble 32 WWF 35 Definitions noun an operating system that is on a disk dos Look “disk operating system” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →