n., pl. myth•oi (ˈmɪθ ɔɪ, ˈmaɪ θɔɪ) 1. the underlying system of beliefs, esp. those dealing with supernatural forces, characteristic of a particular cultural group. 2. myth (def. 1). 3. mythology (def. 1). [1745–55; < Greek mŷthos; see myth]ThesaurusSeemythos