Appalachian /ˌæ.pəˈleɪ.(t)ʃən/adjective 2noun 1forms 3phrases 1 adjective2 •Referring to the region of Appalachia or its characteristics. •Referring to the people and culture of Appalachia. noun1 •A person from Appalachia. formsAppalachians · more Appalachian · most Appalachian Phrases with Appalachian hike the Appalachian TrailTo engage in an extramarital affair.