Something that gives off or sends out energy, particles, radiation, or signals.
From Latin 'emittere' meaning to send out (from 'e-' + 'mittere' = to send), plus '-er' (one who does). Used in physics and engineering for devices that produce radiation or signals.
In physics, emitters are sources of light, heat, or radiation—the sun is a natural emitter of energy, while your phone's radio waves come from electronic emitters, making this a word that describes some of the most fundamental processes in nature!
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