any of a genus (Atriplex) of plants of the goosefoot family, widespread in salty or alkaline areas, having usually silvery foliage and small green flowers; esp., garden orach (A. hortensis), cultivated as a potherb, chiefly in France
Word origin
ME orage < Anglo-Fr orache < OFr arroche < VL *atrapica (for L atriplex) < Gr atraphaxys