Enter a clue or pattern or both:
The Clue
Light detectors (7 letter answer)
The Answer
SENSORS
Tags
Notes
The answer SENSORS is rarely seen, appearing only about once every 1300 puzzles.
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Definition
SENSOR as a noun:
1. (detector, sensor, sensing element) = any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner