Thread:User talk:CodeCat/vættki

I've searched for this word in the dictionaries, and they all differ in the definition of its part of speech: some give it as a pronoun, while Zoega, for instance, seems to have it as a neuter noun. It seems to me that it is a pronoun, but I wonder if I'm right, and, even if it were so, how would it be declined - in all 3 genders or just neuter?