[{"Bold_text": "noun", "List Items": ["a straight line extending from the center of a circle or sphere to the circumference or surface:The radius of a circle is half the diameter.", "the length of such a line.", "any radial radiating part.", "a circular area having an extent determined by the length of the radius from a given or specified central point:every house within a radius of 50 miles.", "a field or range of operation or influence.", "extent of possible operation, travel, etc., as under a single supply of fuel:the flying radius of an airplane.", "Anatomy.the bone of the forearm on the thumb side. Compare ulna ( def 1 ) ulna ( def 1 ).", "Zoology.a corresponding bone in the forelimb of other vertebrates.", "Machinery Now Rare.the throw of an eccentric wheel or cam.", "a rounded corner or edge on a machined or cast piece of metal.", "Entomology.one of the principal longitudinal veins in the anterior portion of the wing of an insect."]}]