Devonian

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.

Full definition of Devonian

Noun

1. (chiefly dated) A native or inhabitant of the English region of Devon.

Proper noun

1. (geology) the Devonian period