a large postal card, with gummed edges, that can be folded lengthwise and sealed with the message inside.
Origin of letter-card
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a card, usually one on which the postage is prepaid, that is sealed by being folded in half so that its gummed edges come into contact with each other
a long card consisting of a number of postcard views, with space for writing a letter on the backs, that is folded like a concertina for posting
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012