The origin of promulgate is a bit murky, or perhaps we should say "milky." It comes from Latin promulgatus, which in turn derives from pro-, meaning "forward," and -mulgare, a form that is probably related to the verb mulgēre, meaning "to milk" or "to extract." Mulgēre is an ancestor of the English word emulsion ("mixture of mutually insoluble liquids"), and it is also related to the Old English word that became milk itself. Like its synonyms declare, announce, and proclaim, promulgate means "to make known publicly." It particularly implies the proclaiming of a dogma, doctrine, or law.