Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ms-dos is a noun meaning "an operating system developed by Bill Gates for personal computers". It carries one recorded sense.
an operating system developed by Bill Gates for personal computers
Definitions, synonyms and semantic relations for ms-dos come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.