English Etymology Calque of Spanish náhuatl del Istmo. Proper noun Isthmus Nahuatl The variety or varieties of Nahuatl spoken in the Isthmus of Tehuantepec. Synonyms: Isthmus Nahua, Isthmus Nahuat Hyponyms Mecayapan Nahuatl Pajapan Nahuatl Translations Translations Spanish: náhuatl del Istmo, mexicano del Istmo Wikiwand - on Seamless Wikipedia browsing. On steroids.