tran·​spi·​ra·​tion | \ ˌtran(t)s-pə-ˈrā-shən \

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

Keep scrolling for more

Other Words from transpiration

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

Examples of transpiration in a Sentence

Recent Examples on the Web

Nizer serves on a number of national transpiration boards, including American Association of Motor Vehicle Administrators Region 1 board, the release said. Jessica Anderson,, "What we know about Christine Nizer, head of Maryland's MVA, which failed to forward key voter information," 26 June 2018 These pores also release water via transpiration, which circulates nutrients through the plant and helps cool it by evaporation. Yasemin Saplakoglu, Scientific American, "Trees Sweat to Keep Cool," 12 Apr. 2018 But exceptionally high temperatures are known to greatly reduce photosynthesis—and most existing plant models suggest this should also decrease transpiration, leaving trees in danger of fatally overheating. Yasemin Saplakoglu, Scientific American, "Trees Sweat to Keep Cool," 12 Apr. 2018 Houseplants release moisture into the air through transpiration, so dry skin and nasal passages are less of a winter weather issue, the magazine asserts. Amy Dewall Dadmun, Milwaukee Journal Sentinel, "Green house effect: Plants enhance life in tiny homes, apartments," 26 Jan. 2018 The program is offered free of charge, but families are responsible for students’ transpiration to and from Roseville. Cathy Locke, sacbee, "High school juniors invited to apply for FBI Teen Academy in Roseville | The Sacramento Bee," 14 Feb. 2018 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 Plants cool air around them through transpiration and their leaves block heat from the sun, as well as absorbing noise. Anna Pujol-mazzini, The Christian Science Monitor, "Urban trees save cities millions of dollars, new research says," 25 Aug. 2017 The plants that produced the most transpiration were those that were under the fluorescent light. Pioneer Press,, "Shout Out: Madeleine Riggs, honored at science fair," 9 Aug. 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.

See More

First Known Use of transpiration

15th century, in the meaning defined above

Keep scrolling for more

Learn More about transpiration

Share transpiration

Statistics for transpiration

Look-up Popularity

Time Traveler for transpiration

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

See more words from the same century

Keep scrolling for more

More Definitions for transpiration


trans·​pi·​ra·​tion | \ ˌtrans-pə-ˈrā-shən \

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 \

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 \ adjective

Keep scrolling for more

More from Merriam-Webster on transpiration

Rhyming Dictionary: Words that rhyme with transpiration

Spanish Central: Translation of transpiration

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

Comments on transpiration

What made you want to look up transpiration? Please tell us where you read or heard it (including the quote, if possible).


irregularly rounded

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
True or False

Test your knowledge - and maybe learn something along the way.

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!