From ZooTerms (Dictionary of Invertebrate Zoology)
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foramen (noun; plural foramina, foramens; Latin foramen, hole): 1. A small opening, orifice or perforation through a bone, shell, membrane or partition.

2. (Arthropoda: Insecta) The opening of an insect cocoon.

3. (Brachiopoda) A round opening at or near the beak facilitating the extension of the pedicle.