: the normal state of turgidity and tension in living cells; especially: the rigidity of a plant that is due to the pressure of the cell contents against the cell walls and that is lost or greatly diminished in wilting
Pressure exerted by fluid in a cell that presses the cell membrane against the cell wall. Turgor is what makes living plant tissue rigid. Loss of turgor, resulting from the loss of water from plant cells, causes flowers and leaves to wilt. Turgor plays a key role in the opening and closing of stomata (seestoma) in leaves.