triˈnundineRom.Antiq.rare—1. [ad. L. trinundin-us, f. tri- + nundina: see nundine.] A period including three successive nundines, i.e. seventeen days. 1891Farrar Darkn. & Dawn xix, Onesimus was doomed to the scourge, as well as to a trinundine of solitude on bread and water.