Definition of "protreptical"

protreptical

adjective
comparative more protreptical, superlative most protreptical
1. (obsolete) Adapted to persuade; hortatory; persuasive.
  Quotations
  The means used to this purpose are partly didactical, and partly protreptical; demonstrating the truth of the gospel, and then urging the professors of those truths to be stedfast[sic] in the faith, and to beware of infidelity.
  February 16, 1668, Seth Ward, The Sinfulness of Infidelity (sermon preached at Whitehall)