Old English word for "ermine"

I'm not sure if this is where I should post this, but while looking up animal names, I found an entry for "made of ermine" (hearmascinnen), but not one for "ermine" itself, which (as several dictionaries have certified) is "hearma". I'm afraid I'm virtually in the dark in regard to any further grammatical specifics, but I can certainly give a good etymological listing of cognates and such if desired.