An-spilde

According to the Old English Dictionary:

an-spilde

adj. [an = and against, spild destruction] Anti-destructive, salutary; salutaris :-- Ðæt biþ anspilde lyb wið eágena dimnesse that is a salutary medicine for dimness of eyes, L. M. I, 2; Lchdm. ii. 30, 14. an-spilde