Definition of radios:
(n) :
(countable) A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound.
(n) :
(uncountable) The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves.
(n) :
(countable) Any audio playing device, such as the on-board entertainment system in a car, usually including a radio receiver as well as the capability to play audio from recorded media; see also car radio.
(n) :
(countable) A device that can transmit radio signals.
(n) :
(Internet, uncountable) The continuous broadcasting of sound via the Internet in the style of traditional radio.
(v) :
(ambitransitive) To use two-way radio to transmit (a message) (to another radio or other radio operator).