Definition of loonie noun from the Oxford Advanced Learner's Dictionary

 

loonie

 noun
noun
BrE BrE//ˈluːni//
 
; NAmE NAmE//ˈluːni//
 
(Canadian English)
 
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the Canadian dollar or a Canadian one-dollar coin Word Originfrom the bird loon (because of the image on the coin) + -ie.
See the Oxford Advanced American Dictionary entry: loonie