Source : Webster's Revised Unabridged Dictionary (1913)

Postil \Pos"til\, n. [F. postille, apostille, LL. postilla,
   probably from L. post illa (sc. verba) after those (words).
   Cf. {Apostil}.]
   1. Originally, an explanatory note in the margin of the
      Bible, so called because written after the text; hence, a
      marginal note; a comment.

            Langton also made postils upon the whole Bible.
                                                  --Foxe.

   2. (R. C. Ch. & Luth. Ch.) A short homily or commentary on a
      passage of Scripture; as, the first postils were composed
      by order of Charlemagne.

Postil \Pos"til\, v. t. [Cf. LL. postillare.]
   To write marginal or explanatory notes on; to gloss. --Bacon.

Postil \Pos"til\, v. i. [imp. & p. p. {Postiled} (?) or
   {Postilled}; p. pr. & vb. n. {Postiling} or {Postilling}.]
   To write postils, or marginal notes; to comment; to
   postillate.

         Postiling and allegorizing on Scripture. --J. H.
                                                  Newman.