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Noun: orifice  o-ru-fis [N. Amer], ó-ru-fis [Brit]
  1. An aperture or hole that opens into a bodily cavity
    "the orifice into the aorta from the lower left chamber of the heart";
    - opening, porta

Derived forms: orifices

Type of: passage, passageway

Encyclopedia: Orifice