orifice(redirected from pulmonary orifice)
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Related to pulmonary orifice: aortic orifice, Right atrioventricular orifice, supraventricular crest
Opening or window in a side or end wall of a waveguide or cavity resonator through which energy is transmitted.
(science and technology)
An aperture or hole.
A mouth, aperture, opening, perforation, passage, or hole. The size of an orifice normally is fixed.