American Dictionary of the English Language

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RA'DIAL, adjective [from Latin radius, a ray, a rod, a spoke. See Radius and Ray.]

Pertaining to the radius or to the fore arm of the human body; as the radial artery or nerve.

The radial muscles are two muscles of the fore arm, one of which bends the wrist, the other extends it.

Radial curves, in geometry, curves of the spiral kind, whose ordinates all terminate in the center of the including circle, and appear like so many semidiameters.