brown rat brown-purple • brown-red · · · Info · Definitions · Synonyms · Characters · · brown rat · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) common domestic rat; serious pest worldwide. Synonyms: brown rat, Norway rat, Rattus norvegicus. · · Noun Definition 1 Synonyms · · · norway rat · · Synonym 1 rattus norvegicus · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 w latin small letter w U+0077