- orthodox
- 1580s, from L.L. orthodoxus, from Gk. orthodoxos "having the right opinion," from orthos "right, true, straight" (see ortho-) + doxa "opinion, praise," from dokein "to seem," from PIE base *dek- "to take, accept" (see decent). As the name of the Eastern Church, first recorded in Eng. 1772; in the sense of branch of Judaism, first recorded 1853.