(ep'i-dū'răl), On (or outside) the dura mater. [Usage note: epidural and extradural are nearly synonymous, with the exception that epidural implies immediate proximity to the dura mater, and extradural may be unconnected with it.] See also: extradural. Synonym(s): peridural
peridural
(pĕr″ĭ-dū′răl) [″ + L. durus, hard] Outside the dura mater.