Wordnet 3.0
ADJECTIVE (1)
1. 
 of or relating to the dura mater; 
The Collaborative International Dictionary of English v.0.48:
Dural \Du"ral\, a. (Anat.)
   Pertaining to the dura, or dura mater.
   [1913 Webster]
WordNet (r) 3.0 (2006):
dural
    adj 1: of or relating to the dura mater