ˈmēniŋ(k)s, ˈmen- noun
( plural me·nin·ges mə̇ˈnin(ˌ)jēz)
Etymology: New Latin, from Greek mēninx membrane — more at member
1. : any of the three membranes that envelop the brain and spinal cord — compare arachnoid , dura mater , pia mater
2. : the solitary sheath of stout connective tissue enclosing the central nervous system of some lower vertebrates and embryos of higher forms — called also primitive meninx