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root pressure

(Science: botany) pressure in the roots which, when the shoot is cut off, will cause liquid to ooze from the root stump, the mechanisms and tissues involved in this process are not clearly understood. A factor that contributes to the transpiration stream in plants, where the movement of water via osmosis to the areas of less water (i.e. further up the plant) causes the water to be 'pushed' up the plant.