dulcian Syllabification: (dul·ci·an)Pronunciation: /ˈdəlsēən/Definition of dulcian noun an early type of bassoon made in one piece. any of various organ stops, typically with 8-foot funnel-shaped flue pipes or 8- or 16-foot reed pipes. Origin: mid 19th century: from German Dulzian, or a variant of dulcianadulcian in other Oxford dictionaries Definition of dulcian in the British & World English dictionary