Definitions of radius

  1. Radii. The semi- diameter of a circle, being a straight line drawn from the centre to the circumference; the exterior bone of the forearm; the ray of a flower. The radius vector, a line drawn from the centre of force to the point of the orbit where the body is supposed to be.
  2. the outer and slightly shorter of the two bones of the human forearm
  3. a circular region whose area is indicated by the length of its radius; " they located it within a radius of 2 miles"
  4. A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
  5. The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.
  6. A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.
  7. The barbs of a perfect feather.
  8. Radiating organs, or color- markings, of the radiates.
  9. The movable limb of a sextant or other angular instrument.
  10. A straight line from the center of a circle or sphere to the circumference or surface; the thicker and shorter bone of the forearm.
  11. ( geom.) A straight line from the centre to the circumference of a circle: anything like a radius, as the spoke of a wheel: the exterior bone of the arm: the ray of a flower:- pl. RADII.
  12. A line from the centre to the circumference of a circle; the outer bone of the fore- arm.
  13. A straight line from the center of a circle or sphere to its periphery.
  14. The bone of the forearm on the same side as the thumb.
  15. A bone of the arm or fore- limb between humerus and carpals, often fused with the ulna ; one of the plates of Aristotle's lantern ; an insect wing- vein.
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