dulcianPronunciation: /ˈdʌlsɪən/Definition of dulcian noun 1an early type of bassoon made in one piece. 2any 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 US English dictionary