Radius vs. Ulna

Radiusnoun

(anatomy) The long bone in the forearm, on the side of the thumb.

Radiusnoun

(zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal.

Radiusnoun

(entomology) One of the major veins of the insect wing, between the subcosta and the media

Radiusnoun

(geometry) A line segment between any point of a circle or sphere and its center.

Radiusnoun

(geometry) The length of this line segment.

Radiusnoun

Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.

Radiusnoun

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

Radiusnoun

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

Radiusnoun

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

Radiusnoun

The barbs of a perfect feather.

Radiusnoun

The movable limb of a sextant or other angular instrument.

Radiusnoun

the length of a line segment between the center and circumference of a circle or sphere

Radiusnoun

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

Radiusnoun

a circular region whose area is indicated by the length of its radius;

Radiusnoun

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

Radiusnoun

support consisting of a radial member of a wheel joining the hub to the rim

Radius

In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel.

Ulnanoun

(anatomy) The bone of the forearm that extends from the elbow to the wrist on the side opposite to the thumb, corresponding to the fibula of the hind limb. Also, the corresponding bone in the forelimb of any vertebrate.

Ulnanoun

The postaxial bone of the forearm, or brachium, corresponding to the fibula of the hind limb. See Radius.

Ulnanoun

An ell; also, a yard.

Ulnanoun

the inner and longer of the two bones of the human forearm

Ulna

The ulna (pl. ulnae or ulnas) is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm.