Radius
One of two bones which constitute the forearm. The largest portion of the radius is at the wrist joint where it articulates with the carpal bones of the hand. Above, the radius articulates with the humerus at the elbow joint.
The radius (Figs. 213, 214) is situated on the lateral side of the ulna, which exceeds it in length and size.
Radius
Effective molecular radius is the size a molecule displays in solution.[5][6] The table of permselectivity for different substances contains examples.
Molecular formula ...
[L. radius, a spoke of a wheel + Gk. summetros, symmetry]
Characterizing a body shaped like a pie or barrel, with many equal parts radiating outward like the spokes of a wheel; present in cnidarians and echinoderms.
radiation ...
Where h0 is the radius of the sphere, M is the mass of the sphere, and G is the gravitational constant.
Primates have modifications to their ulna and radius (bones of the lower arm) allowing them to turn their hand without needing to turn their elbow. Many primates can also swivel or turn their arms at the shoulder.
bone that together with the radius forms the forearm
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
...
radial cut A longitudinal section cut along a radius.
radial micellation Reinforcement of the cell wall of guard cells in specific regions such that the cells curve outward when fully turgid.
When mice were bred with homozygous mutations for both HoxA11 and HoxD11, they were born with neither radius nor ulna in the forelimbs.
Below a joint (elbow or knee), both limbs have a pair of bones (radius and ulna in the arms; tibia and fibula in legs) that connect to another joint (wrist or ankle). The carpals makeup the wrist joint; the tarsals are in the ankle joint.
Adaptive Radiation the process of a species spreading into and making use of a new environment
(ad = to‚ toward; apt = fasten‚ adjust‚ fix; radia = spoke‚ ray‚ radius) ...
 See also: Trans, Human, Class, Bone, Long
  
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