Source : Webster's Revised Unabridged Dictionary (1913)

Meninges \Me*nin"ges\, n. pl.; sing. {Meninx}. [NL., fr. Gr. ?,
   ?, a membrane.] (Anat.)
   The three membranes that envelop the brain and spinal cord;
   the pia mater, dura mater, and arachnoid membrane.

Source : WordNet®

meninx
     n : a membrane (one of 3) that envelops the brain and spinal
         cord [syn: {meninges}]