| 单词 | radius |
| 释义 | radius n. & v. --n (pl. radii or radiuses) 1. Math. a a straight line from the centre to the circumference of a circle or sphere. b a radial line from the focus to any point of a curve. c the length of the radius of a circle etc. 2. a usu. specified distance from a centre in all directions (within a radius of 20 miles; has a large radius of action). 3. a the thicker and shorter of the two bones in the human forearm (cf. ULNA). b the corresponding bone in a vertebrate's foreleg or a bird's wing. 4. any of the five arm-like structures of a starfish. 5. a any of a set of lines diverging from a point like the radii of a circle. b an object of this kind, e.g. a spoke. 6. a the outer rim of a composite flower-head, e.g. a daisy. b a radiating branch of an umbel. --vtr. give a rounded form to (an edge etc.). Phrases and idioms radius vector Math. a variable line drawn from a fixed point to an orbit or other curve, or to any point as an indication of the latter's position. Etymology: L, = staff, spoke, ray |
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