Grút

According to the Old English Dictionary:

grút

pl. n. Fine meal :-- Grút pollis, Wrt. Voc. 290, 63: L. M. i. 61, 1; Lchdm. ii. 132, 15. VI ambra grúta six measures of meal, Th. Chart. 471, 13. [Cf. grytta, grot, greót, and the preceding word.] grut