aérogramme

American  

[air-uh-gram] / ˈɛər əˌgræm /

Or aerogram,

noun

1. a sheet of lightweight paper, bearing an official postal stamp imprint, that is folded to form its own envelope and can be sent via airmail at a special, low rate because of its standard size, light weight, and lack of enclosures.

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Etymology

Origin of aérogramme

From French, dating back to 1895–1900; aero-, -gram ¹