Definition of radius

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Radius (n.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

Lern More About Radius

Radius :: Radius (n.) The movable limb of a sextant or other angular instrument.
Radius :: Radius (n.) The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla..
Ray :: Ray (n.) A radiating part of a flower or plant; the marginal florets of a compound flower, as an aster or a sunflower; one of the pedicels of an umbel or other circular flower cluster; radius. See Radius..
Radius :: Radius (n.) A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2..
Ulna :: Ulna (n.) The postaxial bone of the forearm, or branchium, corresponding to the fibula of the hind limb. See Radius..
Cathetus :: Cathetus (n.) One line or radius falling perpendicularly on another; as, the catheti of a right-angled triangle, that is, the two sides that include the right angle..
Unity :: Unity (n.) Any definite quantity, or aggregate of quantities or magnitudes taken as one, or for which 1 is made to stand in calculation; thus, in a table of natural sines, the radius of the circle is regarded as unity..
Radiuses :: Radiuses (pl. ) of Radiu.
Eccentric :: Eccentric (n.) A circle described about the center of an elliptical orbit, with half the major axis for radius..
Radio- :: Radio- () A combining form indicating connection with, or relation to, a radius or ray; specifically (Anat.), with the radius of the forearm; as, radio-ulnar, radio-muscular, radio-carpal..
Quicken :: Quicken (a.) To shorten the radius of (a curve); to make (a curve) sharper; as, to quicken the sheer, that is, to make its curve more pronounced..
Radius :: Radius (n.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
Lituus :: Lituus (n.) A spiral whose polar equation is r2/ = a; that is, a curve the square of whose radius vector varies inversely as the angle which the radius vector makes with a given line..
Hyporadius :: Hyporadius (n.) One of the barbs of the hypoptilum, or aftershaft of a feather. See Feather..
Radius Vector :: Radius vector (n.) An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite..
Radiale :: Radiale (n.) The bone or cartilage of the carpus which articulates with the radius and corresponds to the scaphoid bone in man.
Radial :: Radial (a.) Of or pertaining to a radius or ray; consisting of, or like, radii or rays; radiated; as, (Bot.) radial projections; (Zool.) radial vessels or canals; (Anat.) the radial artery..
Tangent :: Tangent (v. t.) A tangent line curve, or surface; specifically, that portion of the straight line tangent to a curve that is between the point of tangency and a given line, the given line being, for example, the axis of abscissas, or a radius of a circle produced. See Trigonometrical function, under Function..
Throw :: Throw (n.) The extreme movement given to a sliding or vibrating reciprocating piece by a cam, crank, eccentric, or the like; travel; stroke; as, the throw of a slide valve. Also, frequently, the length of the radius of a crank, or the eccentricity of an eccentric; as, the throw of the crank of a steam engine is equal to half the stroke of the piston..
Hypotrochoid :: Hypotrochoid (n.) A curve, traced by a point in the radius, or radius produced, of a circle which rolls upon the concave side of a fixed circle. See Hypocycloid, Epicycloid, and Trochoid..
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