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1. Oxford American Dictionary

   radius

   • IPA[ˈrādēəs]

   美式

   • n.
     a straight line from the center to the circumference of a circle or sphere.；a radial line from the focus to any point of a curve.
   • v.
     give a rounded form to (a corner or edge)

   • noun: radius, plural noun: radii

2. • 釋義

   n.

   名詞

   • 1. a straight line from the center 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 center 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 corresponding bone in a vertebrate's foreleg or a bird's wing.
   • ▪ any of the main veins in an insect's wing.
   • 3. (in an echinoderm or coelenterate) any of the primary axes of radial symmetry.

   v.

   動詞

   • 1. give a rounded form to (a corner or edge) Brian carefully radiused all the sharp edges and corners the radiused edges feel sleek and unobtrusive in the hand