Fo*ra"men (?), n.; pl. L. Foramina (#), E. Foramines (#). [L., fr. forare to bore, pierce.]
A small opening, perforation, or orifice; a fenestra.
Foramen of Monro Anat., the opening from each lateral into the third ventricle of the brain. -- Foramen of Winslow Anat., the opening connecting the sac of the omentum with the general cavity of the peritoneum.
© Webster 1913.