si·​no·​atri·​al ˌsī-nō-ˈā-trē-əl How to pronounce sinoatrial (audio)
: of, involving, or being the sinus node
sinoatrial block

Example Sentences

Recent Examples on the Web These cells, known as your sinoatrial (SA) node, tell your heart when and how to beat in order to send oxygen-rich blood throughout your body. Rachel Nall, Msn, SELF, 18 Aug. 2022

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sinoatrial.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History


New Latin sinus + atrium

First Known Use

1913, in the meaning defined above

Time Traveler
The first known use of sinoatrial was in 1913

Dictionary Entries Near sinoatrial

Cite this Entry

“Sinoatrial.” Dictionary, Merriam-Webster, Accessed 28 Mar. 2023.

Medical Definition


si·​no·​atri·​al ˌsī-nō-ˈā-trē-əl How to pronounce sinoatrial (audio)
variants also sinuatrial
: of, involving, or being the sinoatrial node
sinoatrial block
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