Leptomeningitis \Lep`to*men`in*gi"tis\
(l[e^]p`t[-o]*m[e^]n`[i^]n*j[imac]"t[i^]s), n. [NL., fr. Gr.
lepto`s small + meningitis.] (Med.)
Inflammation of the pia mater or of the arachnoid membrane.
Source : WordNet®
leptomeningitis
n : inflammation of the leptomeninges