trierarchal

trierarchal

(ˈtraɪəˌrɑːkəl)
adj
(Historical Terms) relating to a trierarch
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014