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Transpiration - "Process by which water that is absorbed by plants, usually through the roots, is evaporated into the atmosphere from the plant surface, such as leaf pores." - U.S. Geological Survey, 2011 (a)

Transpiration - "Vaporization of water from a leaf into the air." - International Union of Pure and Applied Chemistry, 1996

Transpiration - "The process by which water vapor escapes from a living plant and enters the atmosphere." - American Geological Institute, 1976

Transpiration - "Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere ... Transpiration also includes a process called guttation, which is the loss of water in liquid form from the uninjured leaf or stem of the plant, principally through water stomata." - U.S. Geological Survey, 2011 (b)


American Geological Institute, 1976, Dictionary of geological terms (4 ed.): Garden City, New York, Anchor Press, 472 p.

International Union of Pure and Applied Chemistry, 1996, Glossary of terms relating to pesticides: Pure and Applied Chemistry, v. 68, no. 5, p. 1167-1193.

U.S. Geological Survey, 2011a, Water science glossary of terms: U.S. Geological Survey, access date June 1, 2011.

U.S. Geological Survey, 2011b, The water cycle--Transpiration: U.S. Geological Survey, access date June 1, 2011.

Disclaimer: The definitions on this page are provided for information purposes only, and do not indicate endorment by the U.S. Geological Survey.

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