Wiktionary
sinoatrial
a. (context anatomy English) Relating to the venous sinus and the right atrium of the heart
WordNet
Wikipedia
Usage examples of "sinoatrial".
The sinoatrial node must have been destroyed, and Powers only know how much heart and lung.
A cluster of about 10,000 cells called the sinoatrial node, its function is to generate the electrical rhythm that commands the rest of the heart to beat, and it must do so reliably, minute after minute, for three billion beats in a lifetime.