emitter
noun/ɪˈmɪtər/
Frequency rank: #14,311 of 20,003 in the WORDED list (wordfreq data)
Meaning
a device or entity that sends out light, heat, radiation, or other signals

Example sentence
The engineers installed an infrared emitter in the ceiling to broadcast the signal throughout the room.
Synonyms & related words
More words in ranks 14,301–14,400
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