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aperture
an opening or orifice
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canal (alimentary)
the musculomembranous digestive tube extending from the mouth to the anus
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canal (vaginal)
the canal in the female from the vulva to the cervix uteri
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cavity
a hollow place or space, or a potential space, with the body or one of its organs
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constriction
making something narrow; to contract, to close (an opening)
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dilatation, dilation
stretched beyond normal dimensions; the widening of something; 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, as in "the tube in patent"
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perforation
a hole in something, e.g.; perforation of the stomach wall by a gastric 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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study plural endings, pg. 37
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