Transpiration

n. act of transpiring; emission of vapor through the surface of an object

Transpiration may also refer to sweating and hyperhydrosis.Transpiration is the evaporation of water from the aerial parts of plants, especially leaves but also stems, flowers and roots. Leaf transpiration occurs through stomata, and can be thought of as a necessary "cost" associated with the opening of stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. Transpiration also cools plants and enables mass flow of mineral nutrients from roots to shoots. Mass flow is caused by the decrease in hydrostatic (water) pressure in the upper parts of the plants due to the diffusion of water out of stomata into the atmosphere. Water is absorbed at the roots by osmosis, and any dissolved mineral nutrients travel with it through the xylem.
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Noun
1. the passage of gases through fine tubes because of differences in pressure or temperature
(hypernym) natural process, natural action, action, activity
(derivation) transpire, transpirate
2. the process of givng off or exhaling water vapor through the skin or mucous membranes
(hypernym) bodily process, body process, bodily function, activity
(derivation) transpire
3. the emission of water vapor from the leaves of plants
(hypernym) organic process, biological process
(derivation) transpire

n. transpiration, perspiration, sweat, sweating

(n.)
The passing of gases through fine tubes, porous substances, or the like; as, transpiration through membranes.
  

(n.)
The evaporation of water, or exhalation of aqueous vapor, from cells and masses of tissue.
  

(n.)
The act or process of transpiring or excreting in the form of vapor; exhalation, as through the skin or other membranes of the body; as, pulmonary transpiration, or the excretion of aqueous vapor from the lungs. Perspiration is a form of transpiration.