leptomeningitis
noun
lep·to·men·in·gi·tis
| \ -ˌmen-ən-ˈjīt-əs
\
\
plural leptomeningitides\ -ˈjit-ə-ˌdēz
\
\
Medical Definition of leptomeningitis
: inflammation of the pia mater and the arachnoid membrane