Definition of epidural noun from the Oxford Advanced American Dictionary

 

epidural

 noun
noun
NAmE//ˌɛpəˈdʊrəl//
 
(medical)
 
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an anesthetic that is put into the lower part of the back so that no pain is felt below the waist Some mothers choose to have an epidural when giving birth.
See the Oxford Advanced Learner's Dictionary entry: epidural