from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The act or process of transpiring, especially through the stomata of plant tissue or the pores of the skin.

from The Century Dictionary.

  • noun The act or process of transpiring; especially, exhalation through the skin: as, the transpiration of obstructed fluids.
  • noun In botany, the exhalation of watery vapor from the surface of the leaves of plants.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Physiol.) The act or process of transpiring or excreting in the form of vapor; exhalation, as through the skin or other membranes of the body. Perspiration is a form of transpiration.
  • noun (bot.) The evaporation of water, or exhalation of aqueous vapor, from cells and masses of tissue.
  • noun (Physics) The passing of gases through fine tubes, porous substances, or the like.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun botany The loss of water by evaporation in terrestrial plants, especially through the stomata; accompanied by a corresponding uptake from the roots.
  • noun physiology The process of giving off water vapour through the skin or mucous membranes.
  • noun The passage of gases through fine tubes.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the process of giving off or exhaling water vapor through the skin or mucous membranes
  • noun the emission of water vapor from the leaves of plants
  • noun the passage of gases through fine tubes because of differences in pressure or temperature


Sorry, no etymologies found.


  • The net effect of reduced transpiration is that plants consume less water – meaning more remains in the soil and can run off into rivers.

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  • This order shall be effective in any case in which the travel or transpiration is authorized or approved and commenced on or after September 23, 1950.


  • Hales conducted hundreds of experiments on plants that demonstrated the flow of sap in the roots and stalks of plants as well as leaf-based evaporation of water (a process known as transpiration).

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  • This process, called transpiration, is similar to the human cooling effect of perspiration.

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  • Much of the solar energy that falls on a natural forest is dissipated high in the tree canopy through "transpiration," the evaporation of water transmitted from the soil through the roots, stems, and foliage of plants, a process that consumes solar energy and cools the environment.

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  • Abbés Nollet and Menon that animals (cats, pigeons, chaffinches) lose weight when subjected to prolonged electrification, the loss being ascribed to increased "transpiration" under electrical stimulus.

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  • Soil transpiration around a septic system is the movement of oxygen into the soil to aid in the process of breaking down matter and the evaporation of leachate or extra septic moisture.

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  • But planting should not be so dense or with a species that will interfere with soil transpiration or evaporation of leachate.

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  • Green roofs lower heating costs in cold climates by preventing heat escape from buildings and lower air conditioning costs in warm climates, keeping buildings cool via plant transpiration processes.

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  • In fact, such plantings are helpful because they stabilize the soil surface and don't interfere with soil transpiration.

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