Definition of pulvinus in English:

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pulvinus

Pronunciation: /pəlˈvīnəs/ Pronunciation: /-ˈvēnəs/

noun (plural pulvini /-ˌnī/ /-nē/)

Botany
An enlarged section at the base of a leaf stalk in some plants that is subject to changes of turgor, 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.

Origin

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

For editors and proofreaders

Syllabification: pul·vi·nus

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