What does transpirational mean?
Transpirational is an adjective meaning relating to transpiration, the process by which plants lose water vapour, mainly through tiny pores in their leaves. This loss creates a pull that helps draw water and dissolved minerals upward from the roots through the plant's xylem, while also helping to cool the plant. In scientific and agricultural contexts, “transpirational” describes measurable or influential aspects of this process, including transpirational loss, transpirational pull, and transpirational rate. The word can also be understood more broadly in discussions of perspiration, since transpiration has a related physiological sense involving the release of fluid through the skin. However, its most characteristic modern use is botanical. The adjective is uncommon outside technical writing, where it signals that a measurement, effect, or condition concerns the movement or loss of water vapour. Its specialized meaning makes it especially useful in plant physiology, forestry, agriculture, and environmental studies.
adjectiveRelating to or involving transpiration, especially the loss of water vapour from plants through their leaves and other surfaces.
- Relating to or involving transpiration, especially the movement and loss of water vapour through plants.
"High temperatures increased the transpirational demand on the plants, causing them to lose water more rapidly."
"The soil was dry, so the seedlings faced severe transpirational stress."
"Researchers measured the tree's transpirational rate under different levels of sunlight."
Plants do not suck water up from their roots; they pull it upward through their stems using the evaporating power of transpiration.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does transpirational come from?
Transpirational was formed in English from transpire, itself borrowed from Latin transpirare, meaning “to breathe out” or “to breathe through.” The Latin verb combines trans-, indicating through or across, with spirare, “to breathe.” The adjective developed alongside the established English noun transpiration and the related physiological term perspiration, all reflecting the Latin root associated with breathing or vapour passing outward.
Related word forms
How transpirational is actually used
This is primarily a formal scientific term used in plant physiology, horticulture, and related environmental science. It is uncommon in everyday speech.
Easily confused with transpirational
Transpiration is the process of losing water vapour, while transpirational describes something relating to or affecting that process.