radius
[ˈreɪdɪəs]
n
a straight line joining the centre of a circle or sphere to any point on the circumference or surface
the length of this line, usually denoted by the symbol r
the distance from the centre of a regular polygon to a vertex (long radius) or the perpendicular distance to a side (short radius)
the outer and slightly shorter of the two bones of the human forearm, extending from the elbow to the wrist
a corresponding bone in other vertebrates
any of the veins of an insect's wing
a group of ray florets, occurring in such plants as the daisy
any radial or radiating part, such as a spoke.(as modifier)
the lateral displacement of a cam or eccentric wheel
a circular area of a size indicated by the length of its radius
the police stopped every lorry within a radius of four miles
the operational limit of a ship, aircraft, etc
柯林斯
百科
