Geologic period that occurred roughly 360 to 408 million years ago. During this period, the first amphibians and trees appear.

1837, as a geological era, from the English county of Devon, where the Old Red Sandstone formations of that age are prominent, + -ian.

in geologic time, a period lasting from 408m to 360m years ago.

A geological period of the Paleozoic era beginning about 400 million years ago. During this period major diversification of the early land plants occurred. dew point

geological period of 50 million years duration, extending from 395 to 345 million years ago. See time table.

(n) from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites

A period of the Palaeozoic era (417-354 million years ago). It is named after Devonshire, England, where rocks of this age were first studied.

duh-voh-nee-uhn Period of geological time about 400 - 300 million years ago.

A geological time period approximately 410 to 354 million years ago. 

(geology) of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 415 to 360 million years ago (chiefly,dated) Of or pertaining to the English region of [..]