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a breathing hole; an opening by which a confined space has communication with the outer air; air hole.

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
(geology) a protrusion of sediment into a lava flow, formed by the explosive transition of water into steam
(spĭr’ə-kəl, spī’rə-)
An opening through which certain animals breathe, such as the blowhole of a whale or one of the openings in the exoskeleton of an insect.


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