Sÿz'y-gy, n.

n. [Fr. syzygie, Lat. syzygia, Gr. συζυγία, union, from συζευγνύναι, to yoke together, from σύν, with, and ζευγνύναι, to yoke.] (Astron.) The point of an orbit, as of the moon or a planet, at which it is in conjunction or opposition;—commonly used in the plural.

Line of syzygies, the straight line connecting the earth, the sun, and the moon, or a planet, when the latter is in conjunction or opposition;—used chiefly of the moon.