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MS DOS

or MS-DOS

[em-es daws, -dos]
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Trademark.
  1. an operating system for personal computers, originally developed by Microsoft for IBM computers.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ms-dos

MS-DOS

noun
  1. trademark computing a type of disk operating system
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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