radio

(noun) medium for communication. Synonyms: radiocommunication, wireless.

(noun) an electronic receiver that detects and demodulates and amplifies transmitted signals. Synonyms: radio receiver, receiving set, radio set, tuner, wireless.

(noun) a communication system based on broadcasting electromagnetic waves. Synonyms: wireless.

(verb) transmit messages via radio waves. Examples: "He radioed for help."

(adj) indicating radiation or radioactivity. Examples: "Radiochemistry."