: an opening between the two embryonic atria of the heart that exists temporarily at the bottom of the developing interatrial septum and is eventually closed off by this septum and replaced by the ostium secundum
Dictionary Entries Near ostium primum
Cite this Entry
“Ostium primum.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/ostium%20primum. Accessed 22 Dec. 2024.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share