silurian | ||
1. | [ noun ] (geology) from 405 million to 425 million years ago; first air-breathing animals | |
Synonyms: | Silurian_period | |
Related terms: | period Paleozoic | |
silurian | ||
1. | [ noun ] (geology) from 405 million to 425 million years ago; first air-breathing animals | |
Synonyms: | Silurian_period | |
Related terms: | period Paleozoic | |