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WordReference Random House Learner's Dictionary of American English © 2024ˈlight ˌpen, n. [countable]- a light-sensitive device used for pointing at characters or objects on a computer screen.
WordReference Random House Unabridged Dictionary of American English © 2024light′ pen′, [Computers.]- Computinga hand-held light-sensitive device used for pointing at characters or objects on a CRT in order to make or modify drawings or to indicate functions to be performed. Also called light′ pen′cil.
Collins Concise English Dictionary © HarperCollins Publishers:: light pen n - a rodlike device which, when applied to the screen of a cathode-ray tube, can detect the time of passage of the illuminated spot across that point thus enabling a computer to determine the position on the screen being pointed at
- a penlike device, used to read bar codes, that emits light and determines the intensity of that light as reflected from a small area of an adjacent surface
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