devonian period devonian • devonite · · · Info · Definitions · Characters · · devonian period · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites. Synonyms: Devonian, Devonian period, Age of Fishes. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 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 p latin small letter p U+0070 r latin small letter r U+0072 v latin small letter v U+0076