noun
pl. -·dii· or -·uses- a raylike or radial part, as a spoke of a wheel
- any straight line extending from the center to the periphery of a circle or sphere
- the length of such a line
- the circular area or distance limited by the sweep of such a line: no house within a radius of five miles
- the distance a ship or airplane can travel and still return to its point of origin without refueling
- an extent, scope, range, etc. of a limited or specified kind: within the radius of one's experience
- the shorter and thicker of the two bones of the forearm, on the same side as the thumb
- a corresponding bone of the forelimb of a four-legged animal
- Zool.
- any of the planes of division of the body of a radially symmetrical animal
- any of various longitudinal veins in the wing of an insect
Origin of radius
L, rod, spoke (of a wheel), hence radius, ray (of light), uncertain or unknown; perhaps akin to radix, root
