Inflected forms: pl. sto·ma·ta (-m-t) or sto·mas 1.Botany One of the minute pores in the epidermis of a leaf or stem through which gases and water vapor pass. Also called stomate. 2.Anatomy A small aperture in the surface of a membrane. 3. A surgically constructed opening, especially one in the abdominal wall that permits the passage of waste after a colostomy or ileostomy. 4.Zoology A mouthlike opening, such as the oral cavity of a nematode.
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