tran·​spi·​ra·​tion | \ ˌtran(t)s-pə-ˈrā-shən How to pronounce transpiration (audio) \

Definition of transpiration

: the act or process or an instance of transpiring especially : the passage of watery vapor from a living body (as of a plant) through a membrane or pores

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Other Words from transpiration

transpirational \ ˌtran(t)s-​pə-​ˈrā-​shnəl How to pronounce transpirational (audio) , -​shə-​nᵊl \ adjective

Examples of transpiration in a Sentence

Recent Examples on the Web Groupings also help reduce transpiration and evaporation, which is affected by temperature, humidity, and light levels. Arricca Elin Sansone, House Beautiful, "How to Keep Your Plants Alive While You’re on Vacation," 11 Aug. 2020 Definitions for the processes of photosynthesis, respiration, transpiration and assimilation were particularly informative for me. Sally Peterson, oregonlive, "’The New Gardener’s Handbook” awakens intuitive skills, plant passion," 30 June 2020 Trees also cool the air through transpiration — a process where water vapor is emitted by a tree’s leaves. Kimberly Miller,, "Oaks instead of palm trees? Florida’s iconic palms don’t cut it with climate change," 14 Nov. 2019 If the lawn grass is brown, there is much less of the movement of water through the plant (transpiration) and the nitrogen is not taken up. Calvin Finch,, "Your fall and winter lawn care guide for San Antonio," 26 Sep. 2019 Their findings follow a few other studies, including one done during an eclipse over Europe in 1999 that showed changes in sap flow and transpiration in a beech tree near Ghent, Belgium. New York Times, "During a Solar Eclipse, What Are Plants Doing?," 2 July 2019 Through a process called transpiration, plants release water vapor from pores along the underside of their leaves. Jennifer Leman, Popular Mechanics, "4 Reasons Why We Need the Amazon Rainforest," 4 Sep. 2019 This shuts down transpiration and the gaseous exchanges needed for photosynthesis, in which the tree takes in carbon dioxide and releases water and oxygen. Adrian Higgins, Washington Post, "Trees can’t escape the extreme heat. But they do have some clever coping mechanisms.," 20 July 2019 The trees and plants that make up the upper forests have a hierarchy of importance according to their role in the water cycle (transpiration), because water is wealth. Christina Liao, Vogue, "Could Traveling to Green Destinations Make You Happier?," 14 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'transpiration.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of transpiration

15th century, in the meaning defined above

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Time Traveler for transpiration

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The first known use of transpiration was in the 15th century

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Cite this Entry

“Transpiration.” Dictionary, Merriam-Webster, Accessed 29 Nov. 2020.

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More Definitions for transpiration


trans·​pi·​ra·​tion | \ ˌtrans-pə-ˈrā-shən How to pronounce transpiration (audio) \

Kids Definition of transpiration

: the process by which plants give off water vapor through openings in their leaves


tran·​spi·​ra·​tion | \ tran(t)s-pə-ˈrā-shən How to pronounce transpiration (audio) \

Medical Definition of transpiration

: the passage of watery vapor from a living body through a membrane or pores

Other Words from transpiration

transpirational \ -​shnəl, -​shən-​ᵊl How to pronounce transpirational (audio) \ adjective

More from Merriam-Webster on transpiration

Nglish: Translation of transpiration for Spanish Speakers Encyclopedia article about transpiration

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