radius

noun (plural radii /-dɪʌɪ/ or radiuses)

• 1a straight line from the centre to the circumference of a circle or sphere.
• a radial line from the focus to any point of a curve.
• a specified distance from a centre in all directions:there are plenty of local pubs within a two-mile radius

• 2 Anatomy the thicker and shorter of the two bones in the human forearm. Compare with ulna.
• Zoology the bone in a vertebrate’s foreleg or a bird’s wing that corresponds to the radius in a human being.
• Entomology any of the main veins in an insect’s wing.

• 3 Zoology a radially symmetric feature in an echinoderm or coelenterate, e.g. an arm of a starfish.

verb (radiuses, radiusing, radiused)

• give a rounded form to (a corner or edge).