phasis
A phase (of the moon, a planet etc.).
obsolete
[A]s the same face of the moon always is turned to the earth, the lunar tides must be permanent, and if the solid parts of the moon be spherical, must always cover the phasis next to us.
Any phase or aspect of something.
obsolete
He o'er the seas shall love or fame pursue, / And other Months, another Phasis view […].
The first appearance of the new moon.
archaic
Where it comes from
From Late Latin phasis, or its source, Ancient Greek φάσις (phásis, “appearance”).
Adapted from the Wiktionary entry phasis (CC BY-SA 4.0).