perimeter
/pəˈrɪmɪtə(r)/noun
1
- the continuous line forming the boundary of a closed geometrical figure（几何图形的）周, 周边：
the perimeter of a rectangle.
矩形的四边。
1.1
- the length of such a line周长：
the rectangle has a perimeter of 30 cm.
那矩形的周长是30厘米。
1.2
- the outermost parts or boundary of an area or object边缘, 周边：
the perimeter of the garden
那花园的边缘
figurative 〈喻〉my presence on the perimeter of his life.
我在他生活中无足轻重的位置。
1.3
- a defended boundary of a military position or base（军事阵地或基地的）防线。
1.4
- Basketball an area away from the basket, beyond the reach of the defensive team【篮球】外围
2
- an instrument for measuring the extent and characteristics of a person's field of vision视野计。
派生词
perimetric
adjective词源
late Middle English: via Latin from Greek perimetros, based on peri- 'around' + metron 'measure'.