pulvinus
noun
pul·vi·nus
ˌpəl-ˈvī-nəs 
-ˈvē-
-ˈvē-
plural pulvini
ˌpəl-ˈvī-ˌnī
-ˈvē-(ˌ)nē
: a swelling at the base of a petiole or petiolule
Examples of pulvinus in a Sentence
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The pulvinus cells create noticeable movement in plant leaves by enlarging and shrinking.
—
Lydia Rivers, Discover Magazine, 20 July 2021
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Lydia Rivers, Discover Magazine, 20 July 2021
Cite this Entry
“Pulvinus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pulvinus. Accessed 3 Nov. 2025.
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