What is "radicular"

Radicular \Ra*dic"u*lar\ (r[.a]*d[i^]k"[-u]*l[~e]r), a. Of or pertaining to roots, or the root of a plant.

"pertaining to roots," 1830, from Modern Latin radicula, diminutive of Latin radix (see radish) + -ar.

a. (context medicine English) Pertaining to a root or to a radicle; specifically, pertaining to the roots of the spinal nerves, or artery which accompany nerve roots into the spinal cord.