- (n.) The preaxial bone of the forearm or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.
- (n.) The barbs of a perfect feather.
- (n.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
- (n.) The movable limb of a sextant or other angular instrument.
- (n.) A ray or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.
- (n.) Radiating organs or color-markings, of the radiates.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). radius. Retrieved September 20, 2026, from http://smartdefine.org/radius/definitions/2052329 |
| Chicago | Webster's. 2011. "radius" http://smartdefine.org/radius/definitions/2052329 (accessed September 20, 2026). |
| Harvard | Webster's 2011, radius, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/radius/definitions/2052329>. |
| MLA | Webster's. "radius" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/radius/definitions/2052329> |