optical
121optical mouse — UK US noun [C] IT ► a computer mouse that uses light rather than a rolling ball to know when the mouse is being moved: »The computers all come with an optical mouse and a keyboard …
122optical fibre — BrE optical fiber AmE n [U and C] a long thin thread of glass or plastic along which information can be sent through a phone or computer system, using light …
123optical disk — noun count COMPUTING a thin flat round piece of plastic that stores information such as music or written words that can be read using a LASER (=powerful narrow light). Optical disks include CD ROMS and LASERDISKS …
124optical character recognition — (OCR) ability of a computer to recognize printed or handwritten characters by means of an optical scanner and specialized software …
125optical character reader — n. a device for scanning documents by means of OPTICAL CHARACTER RECOGNITION …
126optical disc — or optical disk n. any disk on which data, as computer text files, video images, or music, is recorded as microscopic pits to be read by a laser …
127optical double (star) — or optical double n. DOUBLE STAR (sense 2) …
128optical double (star) — or optical double n. DOUBLE STAR (sense 2) …