signaldetector
nounUK /ˈsɪɡnəl dɪˌtektə/
US /ˈsɪɡnəl dɪˌtektər/
A thing that finds signals like sounds or waves in the air.
The little radio has a signal detector that helps it find stations.
OTHER MEANINGS
2. A device that notices when a message or sign is sent.
The signal detector beeped when the phone got a text.
3. A tool that checks for weak or hidden signals.
Scientists used a signal detector to listen for faraway stars.
4. A part of a machine that warns you about a signal.
The signal detector lit up when the Wi-Fi came back.