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Ra Re Rh

Radial

/ˈrādēəl/

Adjective

1. of or arranged like rays or the radii of a circle; diverging in lines from a common center. (Google Dictionary)
2. of or relating to the radius.(Google Dictionary)

Noun, pl. radii, radiuses

1. the bone in the lower part of your arm on the same side as your thumb. (merriam-webster.com)
2. the bone on the thumb side of the human forearm. (merriam-webster.com)
3. a corresponding part of vertebrates above fishes. (merriam-webster.com)
4 the third and usually largest vein of an insect’s wing. (merriam-webster.com)