Radius Ra"di*us (r[=a]"d[i^]*[u^]s), n.; pl. L. {Radii} (r[=a]"d[i^]*[imac]); E. {Radiuses} (r[=a]"d[i^]*[u^]s*[e^]z). [L., a staff, rod, spoke of a wheel, radius, ray. See {Ray} a divergent line.] 1. (Geom.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere. [1913 Webster]

2. (Anat.) The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of {Artiodactyla}. [1913 Webster]

Note: The radius is on the same side of the limb as the thumb, or pollex, and in man it is so articulated that its lower end is capable of partial rotation about the ulna. [1913 Webster]

3. (Bot.) A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See {Ray}, 2. [1913 Webster]

4. pl. (Zo["o]l.) (a) The barbs of a perfect feather. (b) Radiating organs, or color-markings, of the radiates. [1913 Webster]

5. The movable limb of a sextant or other angular instrument. --Knight. [1913 Webster]

{Radius bar} (Mach.), 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}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Radii — Ra di*i (r[=a] d[i^]*[imac]), n., pl. of {Radius}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Radĭi — (lat.), Mehrzahl von Radius …   Pierer's Universal-Lexikon

  • radii — the plural of radius …   Usage of the words and phrases in modern English

  • radii — [rā′dē ī΄] n. alt. pl. of RADIUS …   English World dictionary

  • radii — pl. of RADIUS. * * * plural of ↑radius * * * radii [radii] [ˈreɪdiaɪ] ; [ˈreɪdiaɪ] pl. of ↑radius …   Useful english dictionary

  • radii — Plural of radius. [L.] * * * radii pl of RADIUS * * * ra·dii (raґde i) [L.] genitive and plural of radius …   Medical dictionary

  • radii — [[t]re͟ɪdiaɪ[/t]] Radii is the plural of radius …   English dictionary

  • radii — plural of radius …   New Collegiate Dictionary

  • radii — Lines that radiate (extend) out from the focus and are lines of flexibility in the scale …   Fisheries — dictionary

  • radii — plural of radius …   Dictionary of ichthyology

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