mandarin duck /ˈmændəɹɪn dʌk/ noun1 •A colorful perching duck that has a red bill, large white crescent above the eye and reddish face, Aix galericulata.Mandarin ducks usually pair for life. In Asia they are thought to be a symbol of love and good luck. Mandarin ducks feed mainly on insects, snails, fish, plants and seeds. — 2019 formsmandarin ducks