radar

ra-dar · noun

imported

Definitions

noun

  1. 1.

    A system for detecting the presence, direction, distance, and speed of objects by sending out pulses of radio waves that are reflected back.

  2. 2.

    (figurative) One's awareness or attention.

Forms

plural: radars

Related words

See also: aviation, detection, sonar
Synonyms: detection system

Etymology

Acronym for "RAdio Detection And Ranging," coined by the United States Navy in 1940.