relating to or denoting a proposed superfamily or phylum of American Indian languages, most of which are now extinct or nearly so. Some scholars include certain living languages of Central and South America, principally Mayan and Mapuche, in this group.
the Penutian family of languages.
from pen and uti, words for 'two' in two groups of Penutian languages + -an
Penutian in other Oxford dictionaries
Definition of Penutian in the US English dictionary