lanthanide series lanthanide • lanthanite · · · Info · Definitions · Characters · · lanthanide series · · Text Common · · Latin · · Scripts 17 · · Length 5 · · Syllables Definitions · · · (noun) the rare-earth elements with atomic numbers 57 through 71; having properties similar to lanthanum. Synonyms: lanthanide series. · · 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 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074