The Collaborative International Dictionary
Triduan
Triduan \Trid"u*an\, a. [L. triduanus, fr. triduum space of
three days; tri- + dies day.]
Lasting three lays; also, happening every third day. [R.]
--Blount.
Wiktionary
triduan
a. 1 Lasting three days. 2 Happening every third day. n. An event lasting three days.
Usage examples of "triduan".
In the following night the storm terminated its triduan existence some time between darkness and dawn.