The Collaborative International Dictionary of English v.0.48:

Dura \Du"ra\, n.
   Short form for Dura mater.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dura
    n 1: the outermost (and toughest) of the 3 meninges [syn: dura
         mater, dura]

Easton's 1897 Bible Dictionary:

Dura
   the circle, the plain near Babylon in which Nebuchadnezzar set
   up a golden image, mentioned in Dan. 3:1. The place still
   retains its ancient name. On one of its many mounds the pedestal
   of what must have been a colossal statue has been found. It has
   been supposed to be that of the golden image.


Hitchcock's Bible Names Dictionary (late 1800's):

Dura, same as Dor