Meaning

adjective containing no meat or milk (or their derivatives) and thus eatable with both meat and dairy dishes according to the dietary laws of Judaism

originBorrowed from Yiddish פּאַרעוו, פּאַרעווע (parev, pareve), of uncertain origin. Suggestions include: * Perhaps from Middle High German bar (“bare, naked”), from Old High German bar, and thus cognate with English bare. * Perhaps from a West Slavic source such as Czech párový (“occurring in pairs”), because according to Jewish dietary laws, meat and milk cannot be combined, but as pareve food…

Etymology from Wiktionary, CC BY-SA 3.0