atrium cordis atrium • atrium dextrum · · · Info · Definitions · Synonyms · Characters · · atrium cordis · · Text Common · · Latin · · Scripts 13 · · Length 5 · · Syllables Definitions · · · (noun) the upper chamber of each half of the heart. Synonyms: atrium cordis, atrium of the heart. · · Noun Definition 1 Synonyms · · · atrium of the heart · · Synonym 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 i latin small letter i U+0069 m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075