Origin of syzygy
- Late Latin sȳzygia from Greek suzugiā union from suzugos paired sun-, su- syn- zugon yoke yeug- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- From Late Latin syzygia (“conjunction"), from Ancient Greek σύζυγος (syzygos, “yoked together"). This word was recognized as English in 1847 (astronomically).