Emily Dickinson Lexicon

RA'DI-AL, a. [from L. radius, a ray, a rod, a spoke. See Radius and Ray.]

Pertaining to the radius, one of the bones of the fore arm of the human body; as, the radial artery or nerve. – Rush. The radial muscles are two muscles of the fore arm, one of which bends the wrist, the other extends it. – Encyc. Parr. 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. – Bailey.