[1] Adler applauds (without going so far as to adopt) Bekker's emendation of ou)d' a)/llws here to ou)damw=s, i.e. 'Not at all an Attic [form]'. Be that as it may, the point being made seems to be that the headword noun is un-Attic when it begins, as here, with omega and not the usual alpha. See generally alpha 882.
[2] Herodotus mentions scimitars several times (see esp. 7.54.2, with a definition), but nowhere do the mss reliably transmit the omega form.