protreptic

Borrowed from Ancient Greek προτρεπτικός (protreptikós, “hortatory”), from προτρέπω (protrépō, “to urge on”).

• (UK) IPA^(key): /pɹəʊˈtɹɛptɪk/
• (General American) IPA^(key): /pɹoʊˈtɹɛptɪk/

protreptic (comparative more protreptic, superlative most protreptic)

1. Serving to instruct; didactic.
   • 1930, Dorothy Tarrant, “The Hippias Major Attributed to Plato (Book Review)”, in The Classical Journal‎^[1], volume 25:

     A protreptic discourse for beginners, no matter what the stage of Plato's development when he wrote it, would contain much elementary matter and would certainly not reveal his most profound thought.

• protreptical

protreptic (plural protreptics)

1. A didactic speech, book, etc.