Permian

Từ điển WordNet v3.1 - WordNet Dictionary

noun

from 280 million to 230 million years ago;
reptiles (Freq. 1)
• Syn:
Permian period
• Instance Hypernyms:
period, geological period
• Part Holonyms:
Paleozoic, Paleozoic era

• Từ đồng nghĩa / Synonyms:
  Permian, Permian period