triduan /ˈtɹɪdjʊən/adjective 2noun 1forms 1 adjective2 •Lasting three days.These Litanies are also called Rogations, and Gang Days among the Saxons, and Gang Dawes by old English writers. They are triduan, and take place on the three days before Ascension Day. — 1841 •Happening every third day.The diurnal or triduan prints are too expensive for every individual, and in consequence the weekly ones have been established; […] . — 1810 noun1 •An event lasting three days. formstriduans
