Age of Fishes

Từ điển WordNet v3.1 - WordNet Dictionary

noun

from 405 million to 345 million years ago;
preponderance of fishes and appearance of amphibians and ammonites
• Syn:
Devonian, Devonian period
• Instance Hypernyms:
period, geological period
• Part Holonyms:
Paleozoic, Paleozoic era