Etymology
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epidural (adj.)

1873, "situated on or affecting the dura mater," from epi- "on" + dura mater + -al (1). The noun meaning "injection into the epidural region" (usually given during childbirth) is attested by 1966.

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Definitions of epidural
1
epidural (n.)
regional anesthesia resulting from injection of an anesthetic into the epidural space of the spinal cord; sensation is lost in the abdominal and genital and pelvic areas; used in childbirth and gynecological surgery;
Synonyms: epidural anesthesia / epidural anaesthesia
2
epidural (adj.)
on or outside the dura mater;
Synonyms: extradural
From wordnet.princeton.edu