Eurydice

c. 1600, "a civil magistrate," especially in Geneva, from French syndic "chief representative" (14c.), cognate with Spanish sindico, Italian sindaco, from Late Latin syndicus "representative of a group or town," from Greek syndikos "public advocate," as an adjective, "belonging jointly to," from syn- "together" (see syn-) + dikē "judgment, justice, usage, custom" (see Eurydice).

The meaning "accredited representative of a university or other corporation" is by c. 1600. Related: Syndical.

In Geneva the syndic was the chief magistrate. Almost all the companies in Paris, the university, etc., had their syndics. The University of Cambridge has its syndics, committees of the senate, forming permanent or occasional syndicates. [Century Dictionary]

"vindication of divine justice," 1771, from French théodicée, title of a 1710 work by Leibniz to prove the justice of God in a world with much moral and physical evil; the elements are from Greek theos "god" (see theo-) + dikē "custom, usage; justice, right; court case" (see Eurydice). Related: Theodicean.