emitter
n.a device or part that sends out a signal, light, or heat. You often see this word in electronics when talking about things like light bulbs or radio transmitters.
n.a device or component that transmits or emits a signal, radiation, or energy. Often used in the context of electronics and physics to describe the source of a specific output.
“The light emitter in the lamp is broken.”
“The radio station uses a powerful antenna as an emitter to broadcast its signal across the entire country.”
“In modern display technology, the emitter is responsible for converting electrical signals into visible light, ensuring that the image remains sharp and vibrant on the screen.”
“It also reinforces hopes that China, which is the world’s biggest greenhouse gas emitter, may be nearing a turning point in decarbonising its economy.”
“Instead of causing emitters to emit more light at a specific frequency, they adapt the emitter's environment so that less light is emitted at unwanted frequencies.”
From emit + -er.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.