Mór-seohtre

According to the Old English Dictionary:

mór-seohtre

a marshy ditch:-- Wæterfrocgan hwílon hí man gesihð of wætere, and swá þeáh sécað tó fúllicum mórseohtrum (in putridine paludis commorantur), Chrd. 96, 28. mor-seohtre