'Subdural' definitions:

Definition of 'subdural'

(from WordNet)
adjective
Below the dura mater but above the arachnoid membrane of the meninges

Definition of 'Subdural'

From: GCIDE
  • Subdural \Sub*du"ral\, a. (Anat.) Situated under the dura mater, or between the dura mater and the arachnoid membrane. [1913 Webster]