- Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.
An example of transpiration is when a plant absorbs water in its roots.
Transpiration is when a plant absorbs water in its roots.
transpiration definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the act or process of transpiring; specif., the giving off of moisture, etc. through the pores of the skin or through the surface of leaves and other parts of plants
Origin: Midieval Latin transpiratio
transpiration definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The act or process of transpiring, especially through the stomata of plant tissue or the pores of the skin.
- tranˌspi·raˈtion·al adjective
transpiration - Medical Definition
The American Heritage® Medical Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The passage of watery vapor through the skin or through any membrane or pore.
transpiration - Science Definition
The process of giving off vapor containing water and waste products, especially through the stomata on leaves or the pores of the skin.A Closer Look Plants need much more water than animals do. But why? Plants use water not only to carry nutrients throughout their tissues, but also to exchange gases with the air in the process known as transpiration. Air, which contains the carbon dioxide that plant cells need for photosynthesis, enters the plant mainly through the stomata (tiny holes under its leaves). The air travels through tiny spaces in the leaf tissue to the cells that conduct photosynthesis. These cells are coated with a thin layer of water. The cell walls do not permit gases to pass through them, but the carbon dioxide can move across the cell walls by dissolving in the water on their surface. The cells remove the carbon dioxide from the water and use the same water to carry out oxygen, the main waste product of photosynthesis. All this mixing of water and air in transpiration, though, has one drawback: more than 90 percent of the water that a plant's roots suck up is lost by evaporation through the stomata. This is why a plant always needs water and why plants that live in dry climates, such as cacti, have reduced leaf surfaces from which less water can escape.