From Longman Dictionary of Contemporary Englishpostcardpost‧card /ˈpəʊstkɑːd $ ˈpoʊstkɑːrd/ ●●● S3 noun [countable] TCMa card that can be sent in the post without an envelope, especially one with a picture on it Don’t forget to send us a postcard!
Examples from the Corpus
postcard• Just answer our question on a postcard.• Presumably to keep the costs down, director Bert I.. Gordon shot real grasshoppers climbing up a postcard of the building.• a postcard of the Statue of Liberty• She likes reading, tapestry, competitions, videos and collecting postcards.• I am sitting on a live postcard.• But you did send me postcards.• Special post boxes will be set up at each walk to receive the postcards.From Longman Business Dictionarypostcardpost‧card /ˈpəʊstkɑːdˈpoʊstkɑːrd/ noun [countable] a small card that can be sent through the post without an envelopeSend us your answer on a postcard. 