aerogram

noun

1. a radiogram.
2. Older Use. a message carried by aircraft; an airmail letter.
3. Meteorology.
   1. a diagram for analyzing thermodynamic processes in the atmosphere.
   2. the record of an aerograph.
4. aérogramme.

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.

noun

1. Also called: air letter an airmail letter written on a single sheet of lightweight paper that folds and is sealed to form an envelope
2. another name for radiotelegram