pe·rim·e·ter /pəˈrɪmɪtə(r)/ n. 1. 【数】周，周长 the perimeter of a circle 圆周 2. 周边，边缘 Dog patrols had been intensified around the camp's perimeter. 在营地周围携带警犬的巡逻队加强了。 the perimeter of a shopping district 商店区的边缘 the perimeter of the legislation 立法的界限 3. 【军】环形防线 4. 【医】视野计 5. 【篮】三分线外区域