vt to write marginal or explanatory notes on; to gloss.
2. postil ·vi to write postils, or marginal notes; to comment; to postillate.
3. postil ·noun a short homily or commentary on a passage of scripture; as, the first postils were composed by order of charlemagne.
4. postil ·noun originally, an explanatory note in the margin of the bible, so called because written after the text; hence, a marginal note; a comment.