Phanerozoic eon

Từ điển WordNet v3.1 - WordNet Dictionary

noun

the period from about 5,400 million years ago until the present
• Syn:
Phanerozoic, Phanerozoic aeon
• Instance Hypernyms:
eon, aeon
• Part Meronyms:
Cenozoic, Cenozoic era, Age of Mammals