/ Dictionary / Index D disk operating system: Meaning and Definition of Find definitions for: disk' op"erating sys"tem Pronunciation: [key] — Computers. Computers. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diskography disk pack Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language