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radius

ra·di·us

radius

pronunciation:
reI di s
features:
Word Explorer, Word Parts
part of speech: noun
inflections: radii, radiuses
definition 1: a straight line segment extending from the center to the surface of a sphere or from the center to the circumference of a circle.
definition 2: the length of a radius line segment; one half of the diameter.
a radius of five meters
definition 3: any structure that radiates from a central point or runs in the direction of a radius.
definition 4: a circular area specified by the length of a radius from a central point.
within a fifty-meter radius
definition 5: the field or extent of useful operation, influence, or jurisdiction.
the radius of the emperor's power
definition 6: the distance that a vehicle can travel with a single load of fuel.
definition 7: one of the two bones of the vertebrate forearm or lower forelimb. (Cf. ulna).
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  measurement, shape
Word Parts
The word radius contains the following part:
radi Latin root that means ray, spoke