| 单词 | diameter |
| 释义 | diameter n. 1. a a straight line passing from side to side through the centre of a body or figure, esp. a circle or sphere. b the length of this line. 2. a transverse measurement; width, thickness. 3. a unit of linear measurement of magnifying power (a lens magnifying 2000 diameters). Derivatives diametral adj. Etymology: ME f. OF diametre f. L diametrus f. Gk diametros (gramme) (line) measuring across f. metron measure |
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