Devonian devolvement • Devonic · · · Info · Definitions · Characters · · Devonian · · Text Latin · · Script 8 · · Length Definitions · · · (noun) from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites. Synonyms: Devonian period, Age of Fishes. · · Noun Definition 1 Characters · · D latin capital letter d U+0044 a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F v latin small letter v U+0076