MS DOS

or MS-DOS

[ em-es daws, -dos ]
/ ˈɛmˌɛs ˈdɔs, -ˈdɒs /

Trademark.

an operating system for personal computers, originally developed by Microsoft for IBM computers.

British Dictionary definitions for ms-dos

MS-DOS
/ (ɛmˈɛsˈdɒs) /

noun

trademark computing a type of disk operating system

Word Origin for MS-DOS

C20: from M ( icro) s ( oft), the company that developed it, + DOS