árdhachta
Definitions (by source)
valiant, powerful, 2924. [Usually árrachta, e.g. FF, 11, 3382 (arr-) ; P. Haicéad, 59 ; DBr, 1, 32, 11, 252.]
Desiderius, otherwise called Sgáthán an Chrábhaidh. Editor: Thomas F. O’Rahilly.