ra·dic·u·lar \(ˈ) ̷ ̷| ̷ ̷ ̷ ̷lə(r)\adjective Etymology: International Scientific Vocabulary radicul- (from Latin radicula little root) + -ar 1.: of or relating to the radicle or the root of a plant 2.: of, relating to, or involving a nerve root < radicular lesions are typically responsible for severe sciatic pain >