Níd-hús

According to the Old English Dictionary:

es;

níd-hús

n. A necessary room :-- Sýn eác binnan claustre slǽpern, beódern, hǽdern, and ealle þá neódhús þe bróðra beþurfon (cetere habitationes usibus fratrum necessariae), Chrd. 21, 18. nid-hus