释义 |
perimeter /pəˈrɪmɪtə /noun1The continuous line forming the boundary of a closed geometrical figure: the perimeter of a rectangle...- He compares the areas of figures with equal perimeters and volumes of solids with equal surface areas, proving a result due to Zenodorus that the sphere has greater volume than any regular solid with equal surface area.
- The number four, for example, would be the ratio of the perimeter of a square to one of its sides and also the ratio of the area of a square to the area of a square whose side is half the original.
- Then these rings also have the additional property that both the inner perimeters are equal and the outer perimeters are equal.
Synonyms circumference, outside, outer edge 1.1The outermost parts or boundary of an area or object: the perimeter of the garden [as modifier]: a perimeter fence...- He said it was the landlord of the estate who had replaced the perimeter fence around the whole of the industrial area.
- One is a low-voltage electric fence around the perimeter of your garden.
- The only sure way of deterring them is to have an electric fence built around the perimeter of the garden.
Synonyms boundary, border, frontier, limits, outer limits, bounds, confines, edge, margin, fringe(s), periphery, borderline, verge literary bourn, marge, skirt rare ambit 1.2 Basketball An area away from the basket, beyond the reach of the defensive team: he was very patient in working the ball around the perimeter...- That is to say, whenever the ball is on the perimeter, 3 defensive players are between the player with the ball and basket.
- With reduced defensive contact on the perimeter, point guards can do their jobs with less harassment.
- More than anything, the team needs his defense on the perimeter against more athletic swingmen.
2An instrument for measuring the extent and characteristics of a person’s field of vision. Derivativesperimetric /pɛrɪˈmɛtrɪk / adjective ...- Definitive perimetric (visual field) evidence, detailed ophthalmoscopic evidence, or both confirm the diagnosis of open-angle glaucoma.
- In the short term the low cost, widespread acceptance, and availability of static visual acuity and perimetric measures justifies their use.
OriginLate Middle English: via Latin from Greek perimetros, based on peri- 'around' + metron 'measure'. Rhymeslimiter, scimitar, velocimeter |