sa node sannyasin • sanopurulent · · · Info · Definitions · Synonyms · Characters · · sa node · · Text Common · · Latin · · Scripts 7 · · Length 2 · · Syllables Definitions · · · (noun) a specialized bit of heart tissue that controls the heartbeat. Synonyms: pacemaker, cardiac pacemaker, sinoatrial node, SA node. · · Noun Definition 1 Synonyms · · · pacemaker · · Synonym 1 cardiac pacemaker · · Synonym 2 sinoatrial node · · Synonym 3 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073