| 单词 | radius |
| 释义 | Word Frequency radius(ˈreɪdɪəs) nounWord forms: plural -dii (-dɪˌaɪ) or -diuses 1. a straight line joining the centre of a circle or sphere to any point on the circumference or surface 2. the length of this line, usually denoted by the symbol r 3. the distance from the centre of a regular polygon to a vertex (long radius) or the perpendicular distance to a side (short radius) 4. anatomy the outer and slightly shorter of the two bones of the human forearm, extending from the elbow to the wrist 5. a corresponding bone in other vertebrates 6. any of the veins of an insect's wing 7. a group of ray florets, occurring in such plants as the daisy 8. a. any radial or radiating part, such as a spoke b. (as modifier) a radius arm 9. the lateral displacement of a cam or eccentric wheel 10. a circular area of a size indicated by the length of its radius the police stopped every lorry within a radius of four miles 11. the operational limit of a ship, aircraft, etc Word origin C16: from Latin: rod, ray, spoke |
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