- any of various small apertures, especially one of the minute orifices or slits in the epidermis of leaves, stems, etc., through which gases are exchanged.
- a mouth or ingestive opening, especially when in the form of a small or simple aperture.
- an artificial opening between two hollow organs or between one hollow organ and the outside of the body, constructed to permit the passage of body fluids or waste products.
- an epidermal pore, present in large numbers in plant leaves, that controls the passage of gases into and out of a plant
- a mouth or mouthlike part
- an artificial opening made in a tubular organ, esp the colon or ileum
