noun Date: circa 1942 a folder that can be sent by mail without enclosure in an envelope by use of a gummed sticker or a precanceled stamp to hold the leaves together
SELF-MAILER
Meaning of SELF-MAILER in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012