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Longman Dictionary of Contemporary English
radii
EXAMPLES FROM CORPUS
▪ Ferry takes vo as including not only the Van der Waals' radii but also the volume associated with vibrational motion.
▪ High-speed ejected debris destroys everything within five or six crater radii of the point of impact.
▪ Imperfect, because the radii differ by about 60 metres.
▪ In this way, gas is continually being fed ever closer to the centre from larger radii.
▪ Such a model facilitates accurate predictions of the average change in charge radii for nuclei.
▪ The computer did most of the hard work and produced four circles with radii 4,781 4,647, 4,718 and 4,685 metres.
▪ The drawing technique of shared radii can be used to construct a variety of curvilinear shapes.
▪ The equatorial and polar radii have been measured by various means and correspond to some level above the cloud tops.
The Collaborative International Dictionary
Radii

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.

  2. (Anat.) The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.

    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 uln

  3. (Bot.) A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.

  4. pl. (Zo["o]l.)

    1. The barbs of a perfect feather.

    2. Radiating organs, or color-markings, of the radiates.

  5. The movable limb of a sextant or other angular instrument.
    --Knight.

    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.

Radii

Radii \Ra"di*i\ (r[=a]"d[i^]*[imac]), n., pl. of Radius.

Wiktionary
radii

n. (plural of radius English)

WordNet
radius
  1. n. the length of a line segment between the center and circumference of a circle or sphere [syn: r]

  2. a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

  3. a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles"

  4. the outer and slightly shorter of the two bones of the human forearm

  5. support consisting of a radial member of a wheel joining the hub to the rim [syn: spoke]

  6. [also: radii (pl)]

radii

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