[ daws, dos ]
See synonyms for DOS on
  1. any of several single-user, command-driven operating systems for personal computers, especially MS DOS.

Origin of DOS


Words Nearby DOS

Other definitions for DOS (2 of 3)



Other definitions for DoS (3 of 3)

[ daws, dos, dee-oh-es ]

  1. Computers. denial-of-service: DoS protection for web servers. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use DOS in a sentence

  • At the end of the stone bridge, at the ponte DOS tres pontes, next to Recife, the guards are more numerous and strict.

  • "Keep cool, Wes," MacHenery whispered to his opponent as they DOS-à-doed back into position.

    The Great Potlatch Riots | Allen Kim Lang
  • His brother Lawrence having fallen ill of consumption, Washington went with him to Barba-DOS, where he had an attack of smallpox.

    The Story of the Thirteen Colonies | H. A. (Hlne Adeline) Guerber
  • The "DOS Estrellas" Mine is yet another example of this successful district.

    Mexico | Charles Reginald Enock
  • There are very few lakes in Brazil, and only one worth speaking of—the Lagoa DOS Platos—which is 150 miles long.

    Martin Rattler | R.M. Ballantyne

British Dictionary definitions for DOS


/ (dɒs) /

n acronym fortrademark computing
  1. disk-operating system, often prefixed, as in MS-DOS and PC-DOS; a computer operating system

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