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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. 2018.
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British Dictionary definitions for ms-dos

MS-DOS

/ɛmˈɛsˈdɒs/
noun
1.
trademark (computing) a type of disk operating system
Word Origin
C20: from M(icro)s(oft), the company that developed it, + DOS
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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