Definition of malduck in English:

malduck

(also mallduck)

noun

Scottish
  • In Orkney and Shetland: the fulmar, Fulmarus glacialis.

Origin

Early 19th century; earliest use found in The Scots Magazine. Probably from malmok or similar variants of mollymawk, after duck.

Pronunciation

malduck

/ˈmaldʌk/