postcard

1. A card for sending messages by post without an envelope (synset 106640445)
   is a type of: card - a rectangular piece of stiff paper used to send messages (may have printed greetings or pictures)
   subtypes:

   • lettercard - a postcard that folds so the message is inside
   • picture postcard - a postcard with a picture on one side
   same as: mailing-card, post card, postal card

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