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Aperture
An opening or orifice
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Canal
The musculomembranous digestive tube extending from mouth to anus
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Canal
In the female from the vulva to the cervix uteri that receives the penis in copulation
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Cavity
A hollow place or space, or a potential space, within the body or one of its organs
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Constriction
Making something narrow, to contract, or close an opening
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Dilatation
Stretched beyond normal dimensions, the widening of something
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Dilation
Expansion; Opening
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Foramen
A natural opening or passage, especially one into or through a bone
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Hiatus
A gap; cleft, or opening
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Introitus
Opening or entrance to a canal or cavity such as the vagina
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Lumen
Opening within a hollow tube or organ
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Meatus
Urinary passage or opening
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Orifice
Any orifice, such as the anal orifice
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Os
Mouth opening; os uteri: mouth of the uterus, or cervix
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Patent
Adjective, meaning open or not plugged in, as in "the tube is patent"
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Perforation
A hole in something, e.g., perforation of the stomach wall by gastic ulcer
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Stoma
Artificial opening established by colostomy, ileostomy and tracheostomy
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Ventricle
A small cavity or chamber, as in the brain or heart
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