laser/ˋlezɚ; ˈleIzə/n [C] a piece of equipment that produces a powerful narrow beam of light, or the beam of light itself 激光器﹐激光装置﹔激光: laser surgery 激光(外科)手术
laserlaserlasersnounan instrument that makes a very strong line of light (called a laser beam). Some lasers are used to cut metal and others are used by doctors in operations.