ordovician period ordovician • ordu · · · Info · Definitions · Characters · · ordovician period · · Text Common · · Latin · · Scripts 17 · · Length 7 · · Syllables Definitions · · · (noun) from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds. Synonyms: Ordovician, Ordovician period. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 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