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radius /ra·di·us/ (ra´de-us) pl. ra´dii   [L.]

1. a line from the center of a circle to a point on its circumference.

2. the bone on the outer or thumb side of the forearm, articulating proximally with the humerus and ulna and distally with the ulna and carpus.

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radius fix´us  a straight line from the hormion to the inion.

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ra·di·us (rd-s)

n. pl. ra·di·us·es or ra·di·i (-d-)

1. A line segment that joins the center of a circle with any point on its circumference.

2. A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located laterally to the ulna.

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radius

[rā′dē·əs] pl. radii

Etymology: L, ray

one of the outer, shorter bones of the forearm lying parallel to the ulna and partially revolving around it. Its proximal end is small and forms a part of the elbow joint. The distal end is large and forms a part of the wrist joint. The radius receives the insertions of various muscles and articulates with the humerus, ulna, scaphoid, lunate, and triangular bones.

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radius [ra´de-us] (L.)

1. a line radiating from a center, or a circular limit defined by a fixed distance from an established point or center.

2. in anatomy, the bone on the outer or thumb side of the forearm.

grid radius grid focus.

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radius

pl. radii [L.]

1. a line radiating from a center, or a circular limit defined by a fixed distance from an established point or center.

2. one of the two long bones of the forearm that extends from the lateral side of the elbow to the medial side of the wrist or carpus. See also Table 10.

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radius curvus syndrome

see curvus.

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RADIUS

Obstetrics A study–Routine Antenatal Diagnostic Imaging with Ultrasound–involving 15,000 ♀ that evaluated fetal ultrasonography Conclusion No benefit