silurian
English Thesaurus
1. from 425 million to 405 million years ago; first air-breathing animals (noun.time)
instance hypernym | : | geological period, period, |
definition | : | a unit of geological time during which a system of rocks formed (noun.time) |
part meronym | : | paleozoic, paleozoic era, |
definition | : | from 544 million to about 230 million years ago (noun.time) |
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