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MS DOS

or MS-DOS

[em-es daws, -dos] /ˈɛmˌɛs ˈdɔs, -ˈdɒs/
Trademark.
1.
an operating system for personal computers, originally developed by Microsoft for IBM computers.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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