mediopassive
adjective
me·dio·pas·sive ˌmē-dē-ō-ˈpa-siv 
: of, relating to, or being a form or voice of a transitive verb which is used in both middle (see middle entry 1 sense 4) and passive (see passive entry 1 sense 1b(1)) meanings or is used only in passive meanings
Word History
Etymology
Latin medius "middle" + -o- + passive entry 1 — more at mid entry 1
First Known Use
1822, in the meaning defined above