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)
orifice,
porta,
opening an aperture or hole that opens into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart"
colostomy a surgical operation that creates an opening from the colon to the surface of the body to function as an anus
tracheostomy,
tracheotomy a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes
surgery a room where a doctor or dentist can be consulted; "he read the warning in the doctor's surgery"
stoma -
a minute epidermal pore in a leaf or stem through which gases and water vapor can pass
A stoma (also stomate; plural stomata) is a pore, found in the leaf and stem epidermis that is used for gas exchange. The pore is bordered by a pair of specialized parenchyma cells known as guard cells which are responsible for regulating the size of the opening and are the closest thing a plant has to a muscle. The term stoma is also used collectively to refer to an entire stomatal complex, both the pore itself and its accompanying guard cells.
OmegaWiki Dictionary
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stoma A small opening on the surface of leaves for gas exchange.
