Save Type Settlement & River Usage Ancient Greek Scripts Φᾶσις(Ancient Greek) Pronounced Pron. /pʰâː.sis/(Classical Greek) [key·simplify] Meaning & History The ancient Greek name for the Rioni River as well as a historical town along that river, meaning unclear. It may be of Georgian-Zan (Mingrelian and Laz), Svan or Semitic origin.