sei whale seiurus aurocapillus • Seiyuhonto · · · Info · Definitions · Synonyms · Characters · · sei whale · · Text Common · · Latin · · Scripts 9 · · Length 4 · · Syllables Definitions · · · (noun) similar to but smaller than the finback whale. Synonyms: sei whale, Balaenoptera borealis. · · Noun Definition 1 Synonyms · · · balaenoptera borealis · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 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 s latin small letter s U+0073 w latin small letter w U+0077