arrhythmia arrhizous • arrhythmic · · · Info · Definitions · Synonyms · Characters · · arrhythmia · · Text Latin · · Script 10 · · Length 4 · · Syllables Definitions · · · (noun) an abnormal rate of muscle contractions in the heart. Synonyms: cardiac arrhythmia. · · Noun Definition 1 Synonyms · · · cardiac arrhythmia · · Synonym 1 Characters · · a latin small letter a U+0061 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079