Etymology
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foramen (n.)

plural foramina, 1670s, from Latin foramen "hole, opening, aperture, orifice," from forare "to pierce" (from PIE root *bhorh- "hole").

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Definitions of foramen

foramen (n.)
a natural opening or perforation through a bone or a membranous structure;
Synonyms: hiatus
From wordnet.princeton.edu