The radius of a circle, shown in red



  • The long bone in the forearm, on the side of the thumb.
  • The lighter bone (or fused portion of bone) in the forelimb of an animal.
  • One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell.
  • A line segment between any point of a circle or sphere and its center.
  • The length of this line segment.
  • Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.


Similar words


  • Borrowed from Latin radius ("ray"). ray.

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