disk operating system

English Thesaurus

1. an operating system that is on a disk (noun.communication)

hypernym	:	operating system, os,
definition	:	(computer science) software that controls the execution of computer programs and may provide various services (noun.communication)

instance hyponym	:	microsoft disk operating system, ms-dos,
definition	:	an operating system developed by Bill Gates for personal computers (noun.communication)