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| ra·di·us [ ráydee əss ] (plural ra·di·i [ ráydee ] or ra·di·us·es) |
noun |
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| Definition: |
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1. mathematics line from center: a straight line extending from the center of a circle to its edge or from the center of a sphere to its surface.
Symbol r
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2. mathematics length of radius: the length of a radius.
Symbol r
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3. circular area: an area enclosed by a circle that has a radius of a particular length
  all the houses within a radius of 2 miles of the explosion
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4. range of effectiveness or influence: the area or range within which somebody or something can act, work, or exert influence effectively
beyond the radius of the governor's influence
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5. anatomy bone in arm or forelimb: the shorter and thicker of the two bones in the human forearm, the one on the thumb side, or the equivalent bone in the lower forelimbs of animals
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6. radiating part: a radiating line, part, or structure
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| [Late 16th century. < Latin, "staff, spoke, ray, beam of light"] |
