fathast

yet, Middle Irish, Early Irish fodesta, fodechtsa, for fo-fect-sa, the d being otiose and caused by analogy (Zim., Zeit.$$+30 21). Atkinson suggests with a query fo'nd(fh)echt-sa. The root word is fecht, time: "under this time, sub hoc tempus". See feachd, time. Hence also feasd (= i fecht-sa).