1. postil - Noun
2. postil - Verb
Originally, an explanatory note in the margin of the Bible, so called because written after the text; hence, a marginal note; a comment.
A short homily or commentary on a passage of Scripture; as, the first postils were composed by order of Charlemagne.
To write marginal or explanatory notes on; to gloss.
To write postils, or marginal notes; to comment; to postillate.
Source: Webster's dictionary