彩管 cǎiguǎn color picture tube Origin Definitions Defs Strokes Stroke Words Sentences Sents 彩 cǎi noun abbreviation of 彩色 cǎisè color color; multi-colored; in color as opposed to black and white管 guǎn abbreviation of 显像管 顯像管 xiǎnxiàngguǎn picture tube A vacuum tube that creates a visible image on a screen, such as a cathode-ray tube (CRT) used in televisions, computer monitors, or oscilloscopes.