Tóþ-wyrm

According to the Old English Dictionary:

es;

tóþ-wyrm

m. A worm in a tooth :-- Wið tóþwærce, gif wyrm ete ða léð . . . Wið tóðwyrmum . . . lǽt reócan on ðone múð, dó blæc hrægl under, ðonne feallaþ ða wyrmas on, Lchdm. ii. 50, 10-20. toþ-wyrm