postil /ˈpɒstɪl/noun 4verb 2forms 5 noun4 •A marginal note. •A collection of homilies. •A short homily or commentary on a passage of Scripture. •(no longer used) A Bible commentary written in its margins. verb2 •To write marginal or explanatory notes on; to gloss. •To write postils, or marginal notes; to comment; to postillate. formspostiled · postilled · postiling · postilling · postils