Etymology
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Silurian (adj.)

1708, "pertaining to the Silures," from Latin Silures "ancient British tribe inhabiting southeast Wales." Geological sense is from 1835, coined by Sir Roderick Impey Murchison (1792-1871) because rocks of this period are especially frequent in Wales.

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Definitions of Silurian

Silurian (n.)
from 425 million to 405 million years ago; first air-breathing animals;
Synonyms: Silurian period
From wordnet.princeton.edu