In biology, turgid refers to cells or tissues that are swollen from water uptake. Turgidity is the state of being swollen or turgid, especially due to high fluid content. Turgidity is a cellular state in which a plant cell, having absorbed water, is in a state of tension. A turgid plant cell is a plant cell that has been filled with water as a result of osmosis. The opposite state of Turgidity is plasmolysis. Turgidity is necessary for plant cells to make them keep standing upright. Plant cells that lose much water have less turgor pressure and tend to become flaccid.