I. ˌe-pi-ˈd(y)u̇r-əl adjective
Date: 1882
: situated upon or administered or placed outside the dura mater
epidural anesthesia
an epidural abscess
II. noun
Date: 1970
: an injection of a local anesthetic into the space outside the dura mater of the spinal cord in the lower back region to produce loss of sensation especially in the abdomen or pelvic region