- radius, r - the length of a line segment between the center and circumference of a circle or sphere
--1 is a kind of length
--1 is a part of diameter, diam
--1 has particulars: semidiameter; radius of curvature - radius - a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
--2 is a kind of straight line
- radius - a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles"
--3 is a kind of region, part
- radius - the outer and slightly shorter of the two bones of the human forearm
--4 is a kind of arm bone
--4 is a part of forearm- spoke, radius - support consisting of a radial member of a wheel joining the hub to the rim
--5 is a kind of support
--5 is a part of bicycle wheel; cartwheel; wagon wheel - radius - a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles"