> Consulting my Old English
Dictionary (or rather, the glossary in > Mitchell and Robinson), I
think the best interpretation is sige-gealdor, > cognate with the ON
sig-galdr "battle magic" that Haukur suggested.
I should note that I
don't think the compound 'siggaldr' is actually attested so we should mark
it with an asterisk; *siggaldr. The closest attested word seems to be
'sighljóð' meaning "battle sound".
I'm not fluent in Old English but it
seems to me that in 'sige-gealdor' neither of the g's is a plosive. I
assume that when you read 'sigaldry' you use a stop for the g. So my
question is: Does it come from another dialect? Does it come from Old
Norse? Or is the modern word a "learned" borrowing from the old language
that doesn't show the historical phonetic development?
And of course
we could still be dealing with something different