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.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019