隱生宙 yǐn shēng zhòu

DEFINITIONS

  1. Cryptozoic
  2. geological eon before the appearance of abundant fossils
  3. hidden life, as opposed to Phanerozoic

CHARACTERS

隱 yǐn hide, conceal; hidden, secret
生 shēng
HSK 1
life, living, lifetime; birth
宙 zhòu
HSK 6
time as concept; infinite time