Definition of radius

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Radius (n.) The movable limb of a sextant or other angular instrument.

Lern More About Radius

Hanse :: Hanse (n.) That part of an elliptical or many-centered arch which has the shorter radius and immediately adjoins the impost.
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..
Eccentric :: Eccentric (n.) A circle described about the center of an elliptical orbit, with half the major axis for radius..
Radii :: Radii (n.) pl. of Radius.
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..
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..
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..
Spoke :: Spoke (n.) The radius or ray of a wheel; one of the small bars which are inserted in the hub, or nave, and which serve to support the rim or felly..
Radius :: Radius (n.) The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla..
Epipodiale :: Epipodiale (n.) One of the bones of either the forearm or shank, the epipodialia being the radius, ulna, tibia, and fibula..
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..
Radian :: Radian (n.) An arc of a circle which is equal to the radius, or the angle measured by such an arc..
Hyporadius :: Hyporadius (n.) One of the barbs of the hypoptilum, or aftershaft of a feather. See Feather..
Apsis :: Apsis (n.) In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum..
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..
Radius :: Radius (n.) The movable limb of a sextant or other angular instrument.
Secant :: Secant (a.) A right line drawn from the center of a circle through one end of a circular arc, and terminated by a tangent drawn from the other end; the number expressing the ratio line of this line to the radius of the circle. See Trigonometrical function, under Function..
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.
Radius Vector :: Radius vector () A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coordinates. See Coordinate, n..
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