From: Old-Irish-L <[log in to unmask]> On Behalf Of Dennis King
> Of course, Sanas Cormaic is full of portmanteau-esque etymologies. The word “sanas” itself is explained as “sain + fios = particular knowlege”, making it either a smushed-together compound or a portmanteau. - D
Even though "sain + fis" is, AFAIAW, a wrong etymology, if it were correct it would be a straightforward compound according to the rules of OIr., since the f would be lenited.