flugelhornPronunciation: /ˈfluːg(ə)lhɔːn/Definition of flugelhorn noun a valved brass musical instrument like a cornet but with a fuller tone. Origin: mid 19th century: from German Flügelhorn, from Flügel 'wing' + Horn 'horn'flugelhorn in other Oxford dictionaries Definition of flugelhorn in the US English dictionary