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part of speech:	noun
definition 1:	an opening or hole that allows for the passage of air for breathing or ventilation; air hole. similar words: outlet, vent
definition 2:	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. similar words: vent
definition 3:	a small vent on the surface of a lava flow, formed by gases. similar words: vent
related words:	aperture, orifice
derivation:	spiracular (adj.)

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