Faul

According to the Old English Dictionary:

a word used as a charm against the bite of an adder :-- Sume án word wið nædran bíte lǽraþ to cweðenne, ðæt is, Faul

Faul

some teach us against bite of adder to speak one word, that is, Faul, L. M. 1, 45; Lchdm. ii. 114, 2. faul