Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An opening in the septum between the right and left atria of the heart, present in the fetus but usually closed soon after birth.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An opening in the septum between the right and left atria of the fetal heart

Etymologies

New Latin forāmen ōvāle : Latin forāmen, opening + Medieval Latin ōvāle, neuter of ōvālis, oval.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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