But the apparently parallel terms “prefix”, “suffix”, “infix” are not grammatical; they refer, rather to positional classes of the morphs which represent bound forms. - Hockett (1958), a pag.286
Prefixed affixes ( prefixes) and suffixed affix (suffixes) may be of the same generalized phonemic shape, and yet they belong to different canonical forms. - Hockett (1958), a pag.286