radius

nouns

the length of a line segment between the center and circumference of a circle or sphere
r, radius
a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
radius
is derived from
radial
is a type of (narrower)
a line traced by a point traveling in a constant direction; a line of zero curvature
"the shortest distance between two points is a straight line"
straight line
a circular region whose area is indicated by the length of its radius
"they located it within a radius of 2 miles"
radius
is a type of (narrower)
the extended spatial location of something
"the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
part, region
the outer and slightly shorter of the two bones of the human forearm
radius
is derived from
radial
is a part of
the part of the superior limb between the elbow and the wrist
forearm
is a type of (narrower)
a bone in the arm
arm bone
support consisting of a radial member of a wheel joining the hub to the rim
radius, spoke, wheel spoke