I'm not the OP, but my attempt through breaking down word etymologies would be something like: ortho: rigid, straight, correct doct: teachings, learnings ic:

I'm not the OP, but my attempt through breaking down word etymologies would be something like: ortho: rigid, straight, correct doct: teachings, learnings ic: of, or pertaining to So orthodoctic seems to have the meaning of "pertaining to rigid or correct teachings".