[em-es daws, -dos]
noun Trademark.
a microcomputer operating system.
Also, MS-DOS. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
MS-DOS (ɛmˈɛsˈdɒs)
computing trademark a type of disk operating system
[C20: from M(icro)s(oft), the company that developed it, + DOS]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

MS-DOS definition

Microsoft Disk Operating System

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
Microsoft Disk Operating System
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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