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blowhole a nostril in the top of the head of a whale, dolphin, or porpoise. The blowhole is used to breathe. [1/3 definitions]
spiracle in zoology, an aperture for breathing, such as a whale's blowhole, the opening behind the eye of sharks, rays, and skates, or the tracheal openings on the sides of the bodies of certain insects and spiders. [1/3 definitions]