Radius

·noun The barbs of a perfect feather.

II. Radius ·noun Radiating organs, or color-markings, of the radiates.

III. Radius ·noun The movable limb of a sextant or other angular instrument.

IV. Radius ·noun A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. ·see Ray, 2.

V. Radius ·noun A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

VI. Radius ·noun The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. ·see ·Illust. of Artiodactyla.