1. from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites; [syn: Devonian, Devonian period, Age of Fishes]
WordNet (r) 3.0 (2006):
Devonian period
n 1: from 405 million to 345 million years ago; preponderance of
fishes and appearance of amphibians and ammonites [syn:
Devonian, Devonian period, Age of Fishes]