syzygial

Century Dictionary and Cyclopedia

1. Pertaining to a syzygy; belonging to or depending upon the moon's position in the line of syzygies. In this sense also, improperly, syzygeal.
2. Having the character of the articulation called a syzygy.

Wiktionary

1. adj. Of or pertaining to a syzygy.

GNU Webster's 1913

1. adj. Pertaining to a syzygy.