What is Articles Improbatory?

Legal Definition
In Scotch law. Articulate averments setting forth the facts relied upon. Bell. That part of the proceedings which corresponds to the charge in an English bill in chancery to set aside a deed. Paters. Comp. The answer is called "articles approbatory."
-- Black's Law Dictionary
Legal Definition
(Scotch) A proceeding corresponding to the bill or complaint in an equity suit.
-- Ballentine's Law Dictionary