IPA: /ˈreɪdiəˌɡræm/
KK: /ˈreɪdiəˌɡræm/
A message sent using radio waves, often for communication purposes.
The doctor received a radiogram with the patient's test results.
Radiogram → It is formed from "radio" (from Latin *radius*, meaning ray) and "gram" (from Greek *gramma*, meaning something written). The word "radiogram" refers to a message transmitted by radio waves, essentially something written that is sent through rays.
Think of 'rays' ('radius') being used to send a 'written message' ('gram') — that's how a radiogram works.