Mǽgþ-sibbBosworth & Toller Anglo-Saxon Old English Dictionary - mǽgþ-sibbAccording to the Old English Dictionary:e;mǽgþ-sibbf. Kindred :-- Mǽgþsybbe parentelæ, Hpt. Gl. 523, 10.Related words: mǽg-sibb. mægþ-sibb