| Main Entry: | radar |
| Part of Speech: | noun |
| Definition: | radio detecting and ranging |
Synonyms: |
direction finding, scanning system, sonar, tracking system |
| Main Entry: | beacon |
| Part of Speech: | noun |
| Definition: | light used as signal, guide |
Synonyms: |
alarm, alert, balefire, beam, bonfire, flare, guidepost, heliograph, lamp, lantern, lighthouse, lodestar, pharos, radar, rocket, sign, signal fire, smoke signal, warning signal, watchtower |
| Main Entry: | detector |
| Part of Speech: | noun |
| Definition: | indicator |
Synonyms: |
discoverer, locater, pointer, radar, revealer, spotter, warner |
| Main Entry: | finder |
| Part of Speech: | noun |
| Definition: | a locating device |
Synonyms: |
bombsight, gunsight, homing device, periscope, radar, sight, sonar, telescopic sight, viewfinder |