perimeter [perimeters](sum of the distance of all the lengths of the sides of an object) noun [UK: pə.ˈrɪ.mɪ.tə(r)] [US: pə.ˈrɪ.mə.tər]No unauthorised persons will be permitted inside the perimeter. = No se permitirán personas sin autorización en el perímetro.
amperímetronoun {m}
ammeter [ammeters](device that measures an electric current) noun [UK: ˈæ.miː.tə(r)] [US: ˈæ.ˌmi.tər]