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ra·di·us
 radius
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- pronunciation:
- reI
di
 s
- features:
- Word Combinations (noun), 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.
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| 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.
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| 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.
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| definition 7: |
one of the two bones of the vertebrate forearm or lower forelimb. (Cf. ulna).
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