Ísen-grǽg

According to the Old English Dictionary:

ísen-grǽg

adj. Iron-grey :-- Ísengrǽg ferrugo, i. color purpuræ subnigræ:ísengrǽgum blóstmeferrugineo flore vel purpureo, Wrt. Voc. ii. 147, 63-67. Ða ísengrǽgan ferrugineas, 38, 44, [Icel. járn-grár : Ger. eisen-grau.] isen-græg