disk operating system disk meter • disk overhead · · · Info · Definitions · Characters · · disk operating system · · Text Common · · Latin · · Scripts 21 · · Length 7 · · Syllables Definitions · · · (noun) an operating system that is on a disk. Synonyms: DOS, disk operating system. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 k latin small letter k U+006B m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079