- a breathing hole; an opening by which a confined space has communication with the outer air; air hole.
- Zoology.
- an aperture or orifice through which air or water passes in the act of respiration, as the blowhole of a cetacean.
- an opening in the head of sharks and rays through which water is drawn and passed over gills.
- one of the external orifices of the tracheal respiratory system of certain invertebrates, usually on the sides of the body.
- any of several paired apertures in the cuticle of an insect, by which air enters and leaves the trachea
- a small paired rudimentary gill slit just behind the head in skates, rays, and related fishes
- any similar respiratory aperture, such as the blowhole in whales
- a protrusion of sediment into a lava flow, formed by the explosive transition of water into steam
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