oval foramen

n.

The oval opening in the septum between the right and left atria of the fetal heart.
A large oval opening in the greater wing of the sphenoid bone, transmitting the mandibular nerve and a small meningeal artery.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.