MoutanPronunciation: /ˈmuːt(ə)n/ (also Moutan peony)Definition of Moutan noun a tall shrubby peony with pink or white blotched flowers, native to China and Tibet and the parent of many garden varieties. Paeonia suffruticosa, family Paeoniaceae Origin: early 19th century: from Chinese mudanMoutan in other Oxford dictionaries Definition of Moutan in the US English dictionary