aerogram

noun

1. (dated)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. (dated, rare)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. (rare)A pneumogram.

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