proterozoic   (TTS Sound)

The proterozoic has 2 Senses.

• proterozoic eon, proterozoic aeon, proterozoic
• 原生代
• from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
• 2,500年から5億4400万年前まで

• proterozoic
• formed in the later of two divisions of the Precambrian era; "proterozoic life forms"
• カンブリア時代の2つの境界の後期に形成された