devonian

(noun, adjective)

adjective

1. (geology) of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 415 to 360 million years ago

2. (chiefly dated) Of or pertaining to the English region of Devon.

noun

1. from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites

Definition categories: time