| 单词 | radius |
| 释义 | radius /ray"dee euhs/, n. , pl. radii /-dee uy'/, radiuses. 1. a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. 2. the length of such a line. 3. any radial or radiating part. 4. a circular area having an extent determined by the length of the radius from a given or specified central point: every house within a radius of 50 miles. 5. a field or range of operation or influence. 6. extent of possible operation, travel, etc., as under a single supply of fuel: the flying radius of an airplane. 7. Anat. the bone of the forearm on the thumb side. Cf. ulna (def. 1). See diag. under skeleton. 8. Zool. a corresponding bone in the forelimb of other vertebrates. 9. Mach. Now Rare. the throw of an eccentric wheel or cam. 10. a rounded corner or edge on a machined or cast piece of metal. 11. Entomol. one of the principal longitudinal veins in the anterior portion of the wing of an insect. [1590-1600; < L: staff, rod, spoke, beam, orig., RAY1] |
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