LATIN DICTIONARYLexicon Latīnum
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“orthodox” in Latin

The English word orthodox itself goes back to Latin orthodoxus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

orthodox
Of persons, verae legis Christianae studiosus (after Ammianus, 25, 10, 5). But *orthodoxus is almost indispensable as technical term (Krebs).
Of things, *orthodoxus; *verae, antiquae, publice receptae doctrinae or religioni conveniens.

Quick answer

What is the Latin word for orthodox?
The usual Latin words for “orthodox” are orthodoxus, vērus, antīquus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.