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Guard cell

/ɡärd sel/

noun
- 1. each of a pair of curved cells that surround a stoma, becoming larger or smaller according to the pressure within the cells.
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Guard cell
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One of a pair of crescent-shaped cells that surround a plant's stoma; changes in the turgidity of the cells cause the opening and closing of the stoma.
Guard cells are specialized plant cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore. The stomatal pores are largest when water is freely available and the guard cells become turgid, and closed when water availability is critically low and the guard cells become flaccid. Wikipedia
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