The Collaborative International Dictionary
Protreptical
Protreptical \Pro*trep"tic*al\, a. [Gr. ?, fr. ? to turn
forward, to urge on.]
Adapted to persuade; hortatory; persuasive. [Obs.]
--Bp.
Ward.
Wiktionary
protreptical
a. (context obsolete English) Adapted to persuade; hortatory; persuasive.