preproparoxytone UK /̩pɹeɪpɹəʊpəˈɹɒksɪtəʊn/US /̩pripɹoʊpəˈɹɑksɪtoʊn/adjective 1noun 1forms 1 adjective1 •Having the stress or accent on the preantepenultimate syllable. noun1 •A preproparoxytone word. formspreproparoxytones