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Webster's Dictionary (1865)

Rā′di-ŭs, n.

noun

n.; Eng. pl. RĀ′DI-ŬS-ES [R.], Lat. pl. RĀ′DI-Ī. [Lat. See RADIAL.]

  1. (Geom.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
  2. (Anat.) The exterior bone of the fore-arm, descending along with the ulna from the elbow to the wrist.
  3. (Bot.) The outer part or circumference of a compound radiate flower, or radiated discous flower; the ray. Martyn.

Radius of curvature (Geom.) of a curve at any point; the radius of a circle which has the same degree of curvature as the curve at that point.

A circle with a line segment drawn from its center to its circumference.
Radius. (1.)
A botanical drawing of a flower with radiating petals and a curved stem.
Radius. (3.)