The Collaborative International Dictionary
Isagogic
Isagogic \I"sa*gog"ic\, Isagogical \I"sa*gog"ic*al\, a. [L. isagogicus, Gr. ?.] Introductory; especially, introductory to the study of theology.
Wiktionary
isagogic
a. (context chiefly theology English) introductory