- a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter.
- the length of such a line.
- any radial or radiating part.
- a circular area having an extent determined by the length of the radius from a given or specified central point: every house within a radius of 50 miles.
- a field or range of operation or influence.
- extent of possible operation, travel, etc., as under a single supply of fuel: the flying radius of an airplane.
- the bone of the forearm on the thumb side.
- a corresponding bone in the forelimb of other vertebrates.
- the throw of an eccentric wheel or cam.
- a rounded corner or edge on a machined or cast piece of metal.
- one of the principal longitudinal veins in the anterior portion of the wing of an insect.
- a straight line joining the centre of a circle or sphere to any point on the circumference or surface
- the length of this line, usually denoted by the symbol r
- the distance from the centre of a regular polygon to a vertex (long radius) or the perpendicular distance to a side (short radius)
- the outer and slightly shorter of the two bones of the human forearm, extending from the elbow to the wrist
- a corresponding bone in other vertebrates
- any of the veins of an insect's wing
- a group of ray florets, occurring in such plants as the daisy
- any radial or radiating part, such as a spoke
- (as modifier)
- the lateral displacement of a cam or eccentric wheel
- a circular area of a size indicated by the length of its radius
- the operational limit of a ship, aircraft, etc
