Diameter



GRE TOEFL 考研

解释

GRE 红宝书

• n. 直径
• ［英］ 直径 ( length of a straight line connecting the center of a circle or sphere to two points on its side)
• ［记］ dia ( 对面) +meter ( 计量, 测量) -> 量到对面的线 -> 直径

Webster Collegiate

noun

• Etymology: Middle English diametre, from Middle French, from Latin diametros, from Greek, from dia- + metron measure — more at measure
• Date: 14th century
• 1. a chord passing through the center of a figure or body
• 2. the length of a straight line through the center of an object
• 3. a unit of enlargement used with a number to indicate magnification by a lens or optical system <an object one millimeter wide magnified 40 diameters appears 40 millimeters wide>
• ? diametral adjective

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