单词	radius
释义	radiusradius /ˈreɪdiəs/ ●○○ noun (plural radii /-diaɪ/) [countable] Etymology ETYMOLOGYradius Origin: 1500-1600 Latin ray, radius 1 within a 10-mile/200-yard etc. radius within a distance of 10 miles, 200 yards, etc. in all directions from a particular place:  The bomb caused damage within a half-mile radius.2math, geometry the distance from the center to the edge of a circle or round object:  The Moon has a radius of approximately 1,737 kilometers.3math, geometry a line drawn straight out from the center of a circle or sphere to its edge4science, biology the outer bone of the lower part of your arm → diameter
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