triduan

triduan

(ˈtrɪdjʊən; ˈtraɪ-)
adj
1. three days long
2. every three days
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014