Windel-stán

According to the Old English Dictionary:

es;

windel-stán

m. A tower with a winding staircase :-- Windelstán coclea, gewind circuitus ascensus (the word occurs in a list of names of buildings), Wrt. Voc. i. 37, 3. [O. H. Ger. wentil-stein cochlea, turris in qua per circuitum scanditur.] windel-stan