orthodox

Etymology

From Late Middle English orthodoxe, from Middle French orthodoxe and its etymon Late Latin orthodoxus, from Ancient Greek ὀρθόδοξος (orthódoxos), from ὀρθός (orthós, “straight”) + δόξα (dóxa, “opinion”).

adj

1. Conforming to the accepted, established, or traditional doctrines of a given faith, religion, or ideology.
   Five important modifications were made by the Pietists to the orthodox doctrine of justification, each corresponding to a distinctive aspect of the movement's agenda. 2005, Alister E McGrath, Iustitia Dei
   ‘These speakers are academics who have specialised in Islamic sciences and are well respected in scholarly circles. It is grossly unjust to suggest that they belong to some fringe ideology rather than orthodox Islam.’ 23 Dec 2009, Andrew Brown, The Guardian
2. Adhering to whatever is customary, traditional, or generally accepted.
   Not only the quack cures of the past but also many forms of treatment given with the best will and intentions in the world by the best and most orthodox doctors of the time seem strange to us today. 1976-03-27, F. Dudley Hart, “History of the treatment of rheumatoid arthritis”, in British Medical Journal, volume 1, number 6012, →DOI, →JSTOR, page 763
3. Of the eastern churches, Eastern Orthodox.
4. Of a branch of Judaism.
5. (botany) Of pollen, seed, or spores: viable for a long time; viable when dried to low moisture content.