
ETYMOLOGY
from Latin protrepticus or its etymon ancient Greek προτρεπτικός (hortatory, instructive) < προ- (pro-) + Greek τρεπτικός (causing change in),
from Greek τρεπτός (liable to be turned or changed)
(from τρέπειν (to turn, direct the course of) + ‑τός)) + ‑ικός (‑ic) + -al
EXAMPLE
“… For the matter, we find, that these words are joyned with the antecedent Doctrine concerning the Excellency of Christ both as Prophet and Priest; and so it’s the second part of the whole, which is, 1. Doctrinal. 2. Practical. For, the former part is didascalical, this latter protreptical and more practical. But if we consider the immediate Connexion, then it will appear, that it’s in a more special manner joyned with the Doctrine of Christ’s Priest-hood, …”
From: An exposition of the Epistle to the Hebrewes
By George Lawson, 1662