太古宙 Tài gǔ zhòu 🔊 Archaean (geological eon before 2500m… + Review this word Meanings Tài gǔ zhòu name Archaean (geological eon before 2500m years ago) Its characters 太tàitoo; so (very)HSK 1古gǔancientHSK 5宙zhòueternity