You can find 6 meanings outlined in OED's entry for your noun masthead, two of which might be labelled obsolete. See ‘Which means & use’ for definitions, use, and quotation evidence. Having said that, as of late, the “masthead” in a newspaper or magazine doesn’t automatically have to seem at https://kqaflpw.bloginwi.com/60130106/masthead-no-further-a-mystery