Latin word radio comes from Latin -one(-onem|m), Latin radius (Ray (of light). Spoke (of a wheel). Staff, rod.)

Detailed word origin of radio

Dictionary entry	Language	Definition
-one(-onem|m)	Latin (lat)
radius	Latin (lat)	Ray (of light). Spoke (of a wheel). Staff, rod.
radio	Latin (lat)	(active) I cause to radiate, irradiate.. (passive) I radiate, emit beams.