aerogram

noun

Etymology: From aero- + -gram.

1. A wireless message.

   “An aërogram to the Examiner yesterday from Quito announced the success of the second attempt, and details of the achievement were at once secured.”

2. A telegram whose transmission included at least one segment sent via airplane.

   “Mr. Holt Thomas gave some details of a projected scheme of communication which combined the telephone or telegraph with the aeroplane. Messages sent by the system would be described as aerograms.”

3. A thin piece of foldable and gummed paper for writing a letter and serving as its own envelope for transit via airmail.
4. A pneumogram.

   “aerogram 1. A roentgenogram of an organ afer it has been injected with air; also called pneumogram.”