The Collaborative International Dictionary
Morosis
Morosis \Mo*ro"sis\ (m[-o]*r[=o]"s[i^]s), n. [NL., fr. Gr. mw`rwsis, fr. mw^ros silly, foolish.] (Med.) Idiocy; fatuity; stupidity.
Wiktionary
morosis
n. (context medicine obsolete English) idiocy; fatuity; stupidity