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

 

postcard

 noun
noun
BrE BrE//ˈpəʊstkɑːd//
 
; NAmE NAmE//ˈpoʊstkɑːrd//
 
(also card)
 
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a card used for sending messages by post without an envelope, especially one that has a picture on one side colourful postcards of California Send us a postcard from Venice! Send your answers on a postcard to the above address. see also picture postcardExtra examples I hate writing holiday postcards. I sent him a postcard of the cathedral. Write your answers on a postcard.
See the Oxford Advanced American Dictionary entry: postcard