orifice

Noun
  1. is a type of: passage, passageway - a path or channel or duct through or along which something may pass
    subtypes:
    • vent - external opening of urinary or genital system of a lower vertebrate
    • blastopore - the opening into the archenteron
    • aortic orifice - the orifice from the lower left chamber of the heart to the aorta
    • stoma - a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ)
    • porta hepatis - opening for major blood vessels to enter and leave the liver
    • spiracle - a breathing orifice
    • mouth - the externally visible part of the oral cavity on the face and the system of organs surrounding the opening
    • os - a mouth or mouthlike opening
    • cervix, cervix uteri, uterine cervix - necklike opening to the uterus
    • fenestra - a small opening covered with membrane (especially one in the bone between the middle and inner ear)
    • cardia - the opening into the stomach and that part of the stomach connected to the esophagus
    • introitus - entrance or opening to a hollow organ or tube (especially the vaginal opening)
    • external orifice, urethral orifice - the orifice through which urine is discharged
    • pylorus - a small circular opening between the stomach and the duodenum
    • anus - the excretory opening at the end of the alimentary canal
    • fontanel, fontanelle, soft spot - any membranous gap between the bones of the cranium in an infant or fetus
    • naris - any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx
    • rima - a narrow elongated opening or fissure between two symmetrical parts
    same as: opening, porta

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