A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.
A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.
The barbs of a perfect.
Radiating organs, or color-markings, of the radiates.
The movable limb of a sextant or other angular instrument. Knight. Radius bar (Math.), a bar pivoted at one end, about which it swings, and having its other end attached to a piece which it causes to move in a circular arc. -- Radius of curvature. See under Curvature.
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