RADAR

noun

1. A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of sent radio waves (usually microwaves) reflected from their surfaces
2. A type of system using such method, differentiated by platform, configuration, frequency, power, and other technical attributes.
3. An installation of such a system or of the transmitting and receiving apparatus.

verb

1. To scan with radar, or as if with radar.