perimeter noun
ADJ. inner, outer | northern, southern, etc.
VERB + PERIMETER mark The river marks the eastern perimeter of our land.
PERIMETER + NOUN fence, wall | road, track
PREP. along the ~ I lugged my suitcase along the perimeter of the square. | around/round the ~ We walked round the perimeter of the prison. | inside/outside the ~ They demonstrated just outside the perimeter of the embassy. | on the ~ There's a small shop on the perimeter of the camp.
You can also check other dicts: perimeter (English, 中文解释 ), wordnet sense, Collins Definition