(pl. radii /-dɪaɪ/ 或者radiuses)
1
- a straight line from the centre to the circumference of a circle or sphere半径。
1.1
- a radial line from the focus to any point of a curve辐射距离。
1.2
- the length of the radius of a circle or sphere半径距离。
1.3
- a specified distance from a centre in all directions（指明的）半径范围：
there are plenty of local pubs within a two-mile radius.
在两英里范围内有许多本地酒馆。
2
- Anatomy the thicker and shorter of the two bones in the human forearm【剖】桡骨。比较ULNA.
2.1
- Zoology the corresponding bone in a vertebrate's foreleg or a bird's wing【动】（脊椎动物前肢或鸟翅的）桡骨。
2.2
- Zoology (in an echinoderm or coelenterate) any of the primary axes of radial symmetry【动】（棘皮动物或腔肠动物的）辐射对称轴。
2.3
- Entomology any of the main veins in an insect's wing【昆】径脉。
(radiused, radiusing)with obj.［often as adj. radiused］
- give a rounded form to (a corner or edge)使（角, 边缘）成弧形。
词源
late 16th cent. (in sense 2)： from Latin, literally 'staff, spoke, ray'.