01 n. A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
pl.
Radii, Radiuses ((rā"dĭ*ī))
-
1.
A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.(Geom.)
-
2.
The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.(Anat.) See: Artiodactyla
-
3.
A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.(Bot.) See: Ray
-
4.
The barbs of a perfect feather.(Zool.)
-
5.
The movable limb of a sextant or other angular instrument.
Phrases & compounds
Radius bar —
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.