| 单词 | perimeter |
| 释义 | perimeter —perimeterless, adj. —perimetral, perimetric /per'euh me"trik/, perimetrical, adj. —perimetrically, adv. —perimetry, n. /peuh rim"i teuhr/, n. 1. the border or outer boundary of a two-dimensional figure. 2. the length of such a boundary. 3. a line bounding or marking off an area. 4. the outermost limits. 5. Mil. a fortified boundary that protects a troop position. 6. Ophthalm. an instrument for determining the peripheral field of vision. [1585-95; < F périmètre < L perimetros (fem.) < Gk perímetron (neut.). See PERI-, -METER] |
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