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To give off water vapor and by-products via the stomata on cannabis leaves.

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Merriam-Webster Online Dictionary
transpire (verb)
transitive verb
intransitive verb
to pass off or give passage to (a fluid) through pores or interstices , especially to excrete (as water) in the form of a vapor through a living membrane (as the skin)
1.
to give off vaporous material , specifically to give off or exude watery vapor especially from the surfaces of leaves
2.
to pass in the form of a vapor from a living body
3.
a) to be revealed come to light
b) to become known or apparent - develop
4.
to take place - go on occur
Merriam-Webster Online Thesaurus
transpire (verb)
to take place
SYNONYMS:
be, befall, betide, chance, come, come about, come down, come off, cook, do, go down, go on, hap, occur, pass, transpire
RELATED WORDS:
break, develop, rise, shape (up); arise, come up, crop (up), materialize, spring (up); intervene; fall out, follow, result, turn out; go off, proceed
Transpire (Wikipedia)

Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. It is a passive process that requires no energy expense by the plant. Transpiration also cools plants, changes osmotic pressure of cells, and enables mass flow of mineral nutrients. When water uptake by the roots is less than the water lost to the atmosphere by evaporation, plants close small pores called stomata to decrease water loss, which slows down nutrient uptake and decreases CO2 absorption from the atmosphere limiting metabolic processes, photosynthesis, and growth.

Overview of transpiration:
  1. Water is passively transported into the roots and then into the xylem.
  2. The forces of cohesion and adhesion cause the water molecules to form a column in the xylem.
  3. Water moves from the xylem into the mesophyll cells, evaporates from their surfaces and leaves the plant by diffusion through the stomata
Transpiration of water in xylem
Stoma in a tomato leaf shown via colorized scanning electron microscope
The clouds in this image of the Amazon rainforest are a result of evapotranspiration.
Transpire (Wiktionary)

English

Etymology

Borrowed from Middle French transpirer, from Medieval Latin transpirare (to breathe through), from Latin trans (across) spirare (to breathe). The sense “to become known” is also present in French, while the sense “to happen” is not; the latter probably developed in English from the former.

Pronunciation

  • (UK) IPA(key): /tɹænˈspaɪ̯ə(ɹ)/
  • (US) IPA(key): /tɹænˈspaɪ̯ɚ/
  • Rhymes: -aɪə(ɹ)

Verb

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Emanate, Originate, Arise, Derive, Stem, Proceed, Radiate, Issue, Flow, Emerge, Occur, Take place, Transpire, Come about, Arise, Develop, Materialize, Emerge, Appear, Surface, Manifest, Come forth, Spring up, Materialize, Appear, Emerge, Manifest, Realize, Actualize, Occur, Happen
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