RADIUS

(Lat.), n. m. Rad(ra1d)'ia-uas(u4s). Gr.. aKrit (1st def.), KtpKis (3d and 3d def's), Trapavn\iov (3d def.). Fr., rayon (1st def.), r. (3d def.). Ger., R. (2d and 3d def's), Strahl (1st def.), Halbme er (2d def.), Speichenknochen (3d def.), Arms pin del (3d def.). 1. A ray of light or of heat. 2. The semi-diameter of a circle or of a sphere. 3. That bone of the forearm which, when the forearm is supinated, lies externally. It articulates with the ulna above and THE RIGHT RADIUS, POSTERIOR ASPECT. with the ulna and carpus below, [a, 48.] 4. In fishes, one of the cartilaginous or horny rods which support the fins. [L. 294.] 5. In botany, see RAY. 6. See BARBULE (3d def.). Auricular radii. Fr., rayons auricula ires. Lines at right angles to a line pa ing through the auricular points. [L.] Medullary radii. Fr., pyramides de Ferrein. Ger., Markfortsatze. Of Ludwig, the bundles of straight uriniferous tubules originating from one main trunk and extending from the medullary nearly to the surface of the cortical portion of the kidney. [J.] R. capitis [Oken]. See Malar BONE. R. fix us. A line drawn from the inion to the punctum alas vomer is. [L.] Radii lent is. Lines radiating from the poles of the crystalline lens, which indicate the sutures of the fibres or the points where the ends of these fibres meet. [L, 31, 351.] Radii medulla res. See Medullary radii. K. surte. See FIBULA (1st def.). [s. 378]