Definition of postcard noun from the Oxford Advanced American Dictionary

 

postcard

 noun
noun
NAmE//ˈpoʊstkɑrd//
 
(also card)
 
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a card used for sending messages by mail without an envelope, especially one that has a picture on one side colorful postcards of California Send us a postcard from Venice! see also picture postcard
See the Oxford Advanced Learner's Dictionary entry: postcard