An orifice is an opening or a hole, most often in the body, such as your mouth or your nostril.

We most often use orifice to describe a natural opening in our bodies, but it can an opening into any cavity, such as a hollowed out tree trunk, or the vent of a heating system. Other definitions of orifice include a type of nozzle used in plumbing applications and a plate used to measure the flow of liquid.

Definitions of orifice

n an aperture or hole that opens into a bodily cavity

“the orifice into the aorta from the lower left chamber of the heart”
opening, porta
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external opening of urinary or genital system of a lower vertebrate
the opening into the archenteron
aortic orifice
the orifice from the lower left chamber of the heart to the aorta
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
a breathing orifice
the externally visible part of the oral cavity on the face and the system of organs surrounding the opening
a mouth or mouthlike opening
cervix, cervix uteri, uterine cervix
necklike opening to the uterus
a small opening covered with membrane (especially one in the bone between the middle and inner ear)
the opening into the stomach and that part of the stomach connected to the esophagus
entrance or opening to a hollow organ or tube (especially the vaginal opening)
external orifice, urethral orifice
the orifice through which urine is discharged
a small circular opening between the stomach and the duodenum
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
any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx
a narrow elongated opening or fissure between two symmetrical parts
mouth of a protozoan
beak, bill, neb, nib, pecker
horny projecting mouth of a bird
beaklike mouth of animals other than birds (e.g., turtles)
the spiracle of a cetacean located far back on the skull
an external tracheal aperture in a terrestrial arthropod
mouth, oral cavity, oral fissure, rima oris
the opening through which food is taken in and vocalizations emerge
incompetent cervix
(obstetrics) uterine cervix that becomes dilated before term and without labor often resulting in miscarriage or premature birth
fenestra of the vestibule, fenestra ovalis, fenestra vestibuli, oval window
fenestra that has the base of the stapes attached to it
fenestra cochleae, fenestra of the cochlea, fenestra rotunda, round window
fenestra leading into the cochlea
pudendal cleavage, pudendal cleft, pudendal slit, rima pudendi, rima vulvae, urogenital cleft, vulvar slit
the fissure between the labia majora
asshole, bunghole
vulgar slang for anus
imperforate anus
a congenital defect of the anus; there is partial or complete obstruction of the anal opening
anterior fontanelle
corresponds to the bregma when bones have ossified
sphenoid fontanel, sphenoid fontanelle, sphenoidal fontanel, sphenoidal fontanelle
the irregularly shaped area on either side of the cranium where the frontal bone and the anterior tip of the parietal bone and the temporal bone and the greater wing of the sphenoid bone meet; corresponds to the pterion when bones have ossified
anterior naris, nostril
either one of the two external openings to the nasal cavity in the nose
posterior naris
either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx
glottis vera, rima glottidis, rima vocalis, true glottis
the space between the two true vocal folds
false glottis, glottis spuria, rima respiratoria, rima vestibuli
the opening between the false vocal folds
Type of:
passage, passageway
a path or channel or duct through or along which something may pass

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