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   radius

   /ˈreɪdɪəs/

   noun

   • 1. a 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.
   • ▪ the length of the radius of a circle or sphere.
   • ▪ a specified distance from a centre in all directions: "there are plenty of local pubs within a two-mile radius"
   • 2. the thicker and shorter of the two bones in the human forearm.
   • ▪ the bone in a vertebrate's foreleg or a bird's wing that corresponds to the radius in a human being.
   • ▪ any of the main veins in an insect's wing.
   • 3. a radially symmetric feature in an echinoderm or coelenterate, e.g. an arm of a starfish.

   verb

   • 1. give a rounded form to (a corner or edge): "Brian carefully radiused all the sharp edges and corners"

   Word Origin late 16th century (in radius (sense 2 of the noun)): from Latin, literally ‘staff, spoke, ray’.

   Scrabble Points: 7

   • R

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   • A

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   • D

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   • I

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   • U

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