1A member of a North American Indian people formerly inhabiting the Pajaro River drainage and adjacent areas of the central coast of California and gathered into the San Juan Bautista Mission after 1799.
2An extinct Costanoan language spoken by the Mutsun.
Of, relating to, or designating this people or their language. Formerly also: †of or designating the languages of the Utian (Miwok-Costanoan) language family or their speakers (obsolete).
Mid 19th century. From Spanish mutsun, alteration of a Mutsun Costanoan name, of uncertain shape, for a tribelet at La Natividad.