Definition of radius :
1. A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.
2. A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
3. Radiating organs, or color- markings, of the radiates.
4. The barbs of a perfect feather.
5. The movable limb of a sextant or other angular instrument.
6. The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.
line, compass, spoke, ankle, reach, universal gas constant, sweep, chord, bone, bone marrow, range, outline, gas constant, interval, carry, curvature, drop, R, wheel spoke, cheekbone, axis, piece, rung, climb, expanse, collarbone, inclined plane, limit, arc, depth, boundary, ball-and-socket joint, rundle, backbone, clavicle, extent, diagonal, coccyx, hairsbreadth, span, diameter, semidiameter, horizontal, roentgen, step, breastbone, scope
- At one point the grade dropped some sixty feet in a distance of three hundred, and the curves were of recklessly short radius. - "Edison, His Life and Inventions", Frank Lewis Dyer and Thomas Commerford Martin.
- In the days when I first knew him Bobbie Cardew was about the most pronounced young rotter inside the four- mile radius. - "My Man Jeeves", P. G. Wodehouse.
- Now and then a tramping and muffled figure came into the radius of light, then passed into the white gloom beyond. - "The Portion of Labor", Mary E. Wilkins Freeman.