pachymeninx

noun
pachy·​me·​ninx | \ -ˈmē-niŋ(k)s How to pronounce pachymeninx (audio) , -ˈmen-iŋ(k)s How to pronounce pachymeninx (audio) \
plural pachymeninges\ -​mə-​ˈnin-​(ˌ)jēz How to pronounce pachymeninges (audio) \

Medical Definition of pachymeninx