Any of a line of preset buttons on a car radio used to select the station to be listened to; pressing one releases the others

A broadcast station from which radio programs are transmitted.

plural of radio telescope

plural of radio station

The transmission of Morse code (etc) using radio

A person who studies radio astronomy.

plural of radio astronomer

(astronomy) Any astronomical object that emits radio waves.

(astronomy) A diffuse region of material, surrounding a galaxy or a pulsar, that emits radio waves

A small radio transmitter attached to an object (especially to an animal) in order to track its location