Definition of phasis in English:

phasis

noun

rare
  • The first appearance of the new moon.

Origin

Mid 17th century (in an earlier sense). From post-classical Latin phasis or its etymon ancient Greek ϕάσις appearance, in Hellenistic Greek also phase from ϕα-, ablaut variant of the stem of ϕαίνειν to bring to light, cause to appear, show + -σις.

Pronunciation

phasis

/ˈfeɪzɪs//ˈfeɪsɪs/