Wundor-hús

According to the Old English Dictionary:

es; u.

wundor-hús

An upper chamber, upper part of a house :-- Þá se mæssepreóst gestód in þám solore þæs mynstres. . . þá þurhwuniendum unonwendedlíce eallum þám getimbre þæs hámes ꝥ wundorhús (solarium) sylf gefeóll, in þám stód se preóst, Gr. D. 119, 27. wundor-hus