ra|di|o

ra|di|o «RAY dee oh», noun, plural -di|os, adjective, verb, -di|oed, -di|o|ing.

–n.

1. the way of sending and receiving words, music, and other sounds by electric waves, without wires: »

We can listen to music broadcast by radio.

2. a device for receiving and making it possible to hear sounds so sent; receiver: »

His radio cost $30.

3. Informal. a message sent by radio.

4. the business of broadcasting by radio: »

He left acting and got a job in radio.

5. the branch of physics dealing with electromagnetic waves as used in communication.

–adj.

1. of or having to do with radio: »

Seventeen minutes after launching, its first radio signals beeped to the tracking station (Time).

2. used in radio: »

a radio transmitter.

3. sent by radio: »

a radio program.

4. of or having to do with electric frequencies higher than 15,000 cycles per second.

–v.t.

1. to transmit or send out by radio: »

The ship radioed a call for help. Word that the proclamation had been signed was radioed ahead from the speeding Presidential limousine (New York Times).

2. to communicate with by radio.

–v.i.

to transmit or send out a message, news, music, and other sounds, by radio.

╂[< radio-, abstracted from radiotelegraphy]

radio-,

combining form.

1. radio: »

Radiobroadcast = a broadcast by radio.

2. radial; radially: »

Radiosymmetrical = radially symmetrical.

3. radiant energy: »

Radiometer = an instrument that measures radiant energy.

4. radioactive: »

Radioisotope = a radioactive isotope.

╂[< Latin radius (originally) ray, beam]