Dictionary of Ichthyology  

foramen (plural foramina) = a small opening, orifice, or perforation. Used when something, e.g. nerve, blood vessel, notochord, passes through the opening.

Cyprinus carpio shoulder girdle, C = cleithrum, E = scapula, PC = coracoid, F = foramen, A = attachment of fin from Kingsley's "Textbook of Vertebrate Zoology, 1906. Photograph by Brian W. Coad.

Canadian Museum of Nature