Syzygy - Encyclopedia Britannica 1911

GEOGRAPHICAL NAMES

SYZYGY (Gr. aui'uyia, a yoking together, from aiv, together, and root ?'uy-, yoke), in astronomy, either of the points at which the moon is most nearly in a line with the sun. The moon passes her syzygies, or is in a syzygy, at new and full moon.

3 Theocritus, Brunck, Analecta veto. poet. graec. i. 304.