Silurian 1
noundomain: time
Princeton WordNet [ver.3.1]
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EnglishDefinition
from 425 million to 405 million years ago; first air-breathing animals
Instance_Hypernym
period 4
noun
a unit of geological time during which a system of rocks formed
Part_meronym
Paleozoic 1
noun
from 544 million to about 230 million years ago
EnglishPart_holonym
Paleozoic 1
noun
from 544 million to about 230 million years ago
