Definition of pulvinus in English:

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Pronunciation: /pʌlˈvʌɪnəs/

noun (plural pulvini /pʌlˈvʌɪnʌɪ/)

An enlarged section at the base of a leaf stalk in some plants, which is subject to changes of rigidity leading to movements of the leaf or leaflet.
Example sentences
  • Leaves move by means of turgor pressure changes at the pulvinus at the base of each lamina.
  • Soluble proteins were extracted from gravistimulated pulvini and subjected to protein phosphorylation reactions.
  • The ion flux occurs within seconds after gravistimulation and establishes pH gradients across roots and maize pulvini.


Mid 19th century: from Latin, literally 'cushion'.

For editors and proofreaders

Line breaks: pul|vi¦nus

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