postcard /ˈpoʊstˌkɑɹd/verb 2noun 1forms 3phrases 1 verb2 •To send a postcard to someone.to postcard one's friends •To send by means of a postcard.to postcard one's news noun1 •A rectangular piece of thick paper or thin cardboard, typically used for sending messages by mail without the need for an envelope. formspostcarded · postcarding · postcards Phrases with postcard answer on a postcardA brief answer or opinion.