\Or"tho*dox\, a. [L. orthodoxus, Gr. 'orqo`doxos;
'orqo`s right, true + do`xa opinion, dokei^n to think, seem;
cf. F. orthodoxe. See {Ortho-}, {Dogma}.]
1. Sound in opinion or doctrine, especially in religious
   doctrine; hence, holding the Christian faith; believing
   the doctrines taught in the Scriptures; -- opposed to
   {heretical} and {heterodox}; as, an orthodox Christian.
2. According or congruous with the doctrines of Scripture,
   the creed of a church, the decree of a council, or the
   like; as, an orthodox opinion, book, etc.
3. Approved; conventional.
         He saluted me on both cheeks in the orthodox manner.
                                               --H. R.
                                               Haweis.
Note: The term orthodox differs in its use among the various
      Christian communions. The Greek Church styles itself
      the ``Holy Orthodox Apostolic Church,'' regarding all
      other bodies of Christians as more or less heterodox.
      The Roman Catholic Church regards the Protestant
      churches as heterodox in many points. In the United
      States the term orthodox is frequently used with
      reference to divergent views on the doctrine of the
      Trinity. Thus it has been common to speak of the
      Trinitarian Congregational churches in distinction from
      the Unitarian, as Orthodox. The name is also applied to
      the conservative, in distinction from the ``liberal'',
      or Hicksite, body in the Society of Friends.
      --Schaff-Herzog Encyc.