An open space allowing passage

• vent

  1. Forceful expression or release of pent-up thoughts or feelings:
  2. An opening permitting the escape of fumes, a liquid, a gas, or steam.
  3. The small hole at the breech of a gun through which the charge is ignited.

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  1. Forceful expression or release of pent-up thoughts or feelings:
  2. An opening permitting the escape of fumes, a liquid, a gas, or steam.
  3. The small hole at the breech of a gun through which the charge is ignited.

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• outlet

  1. A passage for escape or exit; a vent.
  2. A means of release or gratification, as for energies, drives, or desires:
  3. A stream that flows out of a lake or pond.

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  1. A passage for escape or exit; a vent.
  2. A means of release or gratification, as for energies, drives, or desires:
  3. A stream that flows out of a lake or pond.

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• opening

  1. The act or an instance of becoming open or being made to open:
  2. A gap, breach, or aperture:
  3. A clearing in the woods.

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  1. The act or an instance of becoming open or being made to open:
  2. A gap, breach, or aperture:
  3. A clearing in the woods.

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• mouth

  1. The body opening through which an animal takes in food.
  2. The cavity lying at the upper end of the digestive tract, bounded on the outside by the lips and inside by the oropharynx and containing in humans and certain other vertebrates the tongue, gums, and teeth.
  3. This cavity regarded as the source of sounds and speech.

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  1. The body opening through which an animal takes in food.
  2. The cavity lying at the upper end of the digestive tract, bounded on the outside by the lips and inside by the oropharynx and containing in humans and certain other vertebrates the tongue, gums, and teeth.
  3. This cavity regarded as the source of sounds and speech.

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• hole

  1. A hollowed place in something solid; a cavity or pit:
  2. An opening or perforation:
  3. An opening in a defensive formation, such as the area of a baseball infield between two adjacent fielders.

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  1. A hollowed place in something solid; a cavity or pit:
  2. An opening or perforation:
  3. An opening in a defensive formation, such as the area of a baseball infield between two adjacent fielders.

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• aperture

  1. An opening, such as a hole, gap, or slit.
  2. A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.
  3. The diameter of such an opening, often expressed as an f-number.

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  1. An opening, such as a hole, gap, or slit.
  2. A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.
  3. The diameter of such an opening, often expressed as an f-number.

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