Definition of pulvinus in English:


Line breaks: pul|vi¦nus
Pronunciation: /pʌlˈvʌɪnəs

noun (plural pulvini /-nʌɪ/)

  • 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.
    More 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'.

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a small amount; a little