Sætern-

According to the Old English Dictionary:

Sæter-niht, e;

Sætern-

f. Friday night, the night between Friday and Saturday :-- His (Christ) líc læg on byrgene ða Sæterniht and Sunnanniht his body lay in the sepulchre on the nights of Friday and Saturday, Homl. Th. i. 216, 27. [R. Glouc. Sater-niȝt.] sætern-