Definition of postil

• n. - Originally, an explanatory note in the margin of the Bible, so called because written after the text; hence, a marginal note; a comment.
• n. - A short homily or commentary on a passage of Scripture; as, the first postils were composed by order of Charlemagne.
• v. t. - To write marginal or explanatory notes on; to gloss.
• v. i. - To write postils, or marginal notes; to comment; to postillate.