Óst

According to the Old English Dictionary:

es;

óst

m. (?) A knot, knob:--Óst nodus, Txts. 80, 688: Wrt. Voc. ii. 60, 66. Copses, óstes cippi, Hpt. Gl. 482, 61. Yfele treówes on óste yfel nægel oððe wecg on tó fæstnigenne ys male arboris nodo malus clavus aut cuneus infingendus est, Scint. 27. Of ðǽm óstum ðæs treówes flóweþ út swétes stences wǽte, Shrn. 67, 29. ost