what religion “orthodox” mean?

what religion “orthodox” mean?
is it muslims or catholics, with races can be orthodox?
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Answer by Ollie
“Orthodox” is a word derived from the Greek for “correct teaching.” Accordingly, one can be an orthodox Muslim, orthodox Lutheran, or even an orthodox Marxist.
In the history of Christianity the Western and Eastern (now called Roman Catholic and Orthodox) churches split apart over 1000 years ago.
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