Submitted by György Chityil ... on Fri, 01/19/2018 - 23:49 Hierarchy: AdjectiveDescription: {{form of|Attributive form|operating system|nodot=1}}, ''noun''.Ngram: operating-systemNgram Text: operating-systemSource: WiktionaryIssue: 0Wiktionary tag: form ofAttributive formoperating systemnodot=1Ngram Count: 1