Definitions for stomaˈstoʊ mə; ˈstoʊ mə tə, ˈstɒm ə-, stoʊˈmɑ tə
This page provides all possible meanings and translations of the word stoma
stoma, stomate, pore(noun)
a minute epidermal pore in a leaf or stem through which gases and water vapor can pass
a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ)
One of the tiny pores in the epidermis of a leaf or stem through which gases and water vapor pass.
A small opening in a membrane; a surgically constructed opening, especially one in the abdominal wall that permits the passage of waste after a colostomy or ileostomy.
A mouthlike opening, such as the oral cavity of a nematode.
An artificial anus.
one of the minute apertures between the cells in many serous membranes
the minute breathing pores of leaves or other organs opening into the intercellular spaces, and usually bordered by two contractile cells
the line of dehiscence of the sporangium of a fern. It is usually marked by two transversely elongated cells. See Illust. of Sporangium
a stigma. See Stigma, n., 6 (a) & (b)
Origin: [NL., fr. Gr. , , a mouth.]
In botany, a stoma is a pore, found in the epidermis of leaves, stems and other organs that is used to control gas exchange. The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening. The term is also used collectively to refer to an entire stomatal complex, both the pore itself and its accompanying guard cells. Air containing carbon dioxide and oxygen enters the plant through these openings and is used in photosynthesis in the mesophyll cells and respiration, respectively. Oxygen produced as a by-product of photosynthesis diffuses out to the atmosphere through these same openings. Also, water vapor is released into the atmosphere through these pores in a process called transpiration. Stomata are present in the sporophyte generation of all land plant groups except liverworts. Dicotyledons usually have more stomata on the lower epidermis than the upper epidermis. Monocotyledons, on the other hand, usually have the same number of stomata on the two epidermes. In plants with floating leaves, stomata may be found only on the upper epidermis; submerged leaves may lack stomata entirely.
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