post card(n = noun.communication) mailing-card, postal card, postcard - a card for sending messages by post without an envelope;

N  correspondence, letter, epistle, note, billet, post card, missive, circular, favor, billet-doux, chit, chitty, letter card, picture post card, postal, card, despatch, dispatch, bulletin, these presents, rescript, rescription, post, epistolary, furor scribendi.