Lewis & Short

mȳthŏlŏgĭcus, a, um, adj., = μυθολογικός, of or belonging to mythology, mythological (late Lat.).
In plur. subst.: mȳ-thŏlŏgĭca, ōrum, n., mythological matters: Mythologicōn liber, the title of a work of Fulgentius, also called Mythologiarum liber, v. mythologia.