perimeter

perimeter
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。
    ■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。
    ■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。
    my presence on the perimeter of his life.
    我没有引起他的注意。
    ■a defended boundary of a military position or base
    （军事阵地或基地的）防线
    ■(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
perimetric
adjective
语源
  1. late Middle English: via Latin from Greek perimetros, based on peri- 'around' + metron 'measure'
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