Paleozoic era

Từ điển WordNet v3.1 - WordNet Dictionary

noun

from 544 million to about 230 million years ago
• Syn:
Paleozoic
• Instance Hypernyms:
era, geological era
• Part Meronyms:
Permian, Permian period, Carboniferous, Carboniferous period, Devonian,
Devonian period, Age of Fishes, Silurian, Silurian period, Ordovician, Ordovician period,
Cambrian, Cambrian period