1
: an opening in the septum between the two atria of the heart that is normally present only in the fetus
During fetal life, this small tunnel, the foramen ovale, allows blood to bypass the lungs … . Yet in as many as 10 percent of people, physicians now estimate, the hole remains open, or patent.—Richard Saltus
2
: an oval opening in the greater wing of the cranial sphenoid bone for passage of a nerve supplying the mouth and jaw
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Merriam-Webster unabridged
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