Pronunciation: (op"tō-i-lek-tron'iks, -ē"lek-), [key]
—n. (used with a sing. v.)
the branch of electronics dealing with devices that generate, transform, transmit, or sense optical, infrared, or ultraviolet radiation, as cathode-ray tubes, electroluminescent and liquid crystal displays, lasers, and solar cells.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.