Doctrinal

a. [L. Lat. doctrinalis, from Lat. doctrina; Fr., Pr., & Sp. doctrinal, Pg. doutrinal, It. doctrinale. See DOCTRINE.]

1. Pertaining to doctrine; containing a doctrine or statement of what is to be believed; as, a doctrinal observation; a doctrinal proposition.
2. Pertaining to the act or means of teaching.

The word of God serveth no otherwise than in the nature of a doctrinal instrument. Hooker.