Otomian
/ˌəʊtəˈmiːən/ /əˈtəʊmɪən/noun
A group of related central Mexican languages, including Otomi and Mazahua, belonging to the Oto-Manguean family. Also (occasionally) specifically: the language of the Otomi people.
adjective
Of, relating to, or designating this group or its languages.
Origin
Early 20th century. From Otomi + -an.