left atrium of the heart left atrium • left bank · · · Info · Definitions · Synonyms · Characters · · left atrium of the heart · · Text Common · · Latin · · Scripts 24 · · Length 7 · · Syllables Definitions · · · (noun) the left upper chamber of the heart that receives blood from the pulmonary veins. Synonyms: left atrium, left atrium of the heart, atrium sinistrum. · · Noun Definition 1 Synonyms · · · left atrium · · Synonym 1 atrium sinistrum · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 f latin small letter f U+0066 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075