pl. of Radius.
In a circle, the radius is simply the distance from the center to the edge. In more complex shapes, there may be more than one radius. Radii is the plural form.
(the plural form of the word radius) radial threads attached to the outer from threads and converge in the hub, thus forming the spokes of the orb web; the number of radii is often characteristic of specific species
Radii is the plural form of radius.
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the main bones of the forearms.