Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† mĕthŏdĭum, ii, n., = μεθόδιον, a witty conceit, a jest, joke (post-Aug.): Trimalchio ejusmodi methodio laetus, Carpe, inquit, etc. (al. metōdīum, i. e. μετωδεῖον, an inserted song), Petr. 36, 5.