Definition of pulvinus in English:

pulvinus

Syllabification: pul·vi·nus
Pronunciation: /pəlˈvīnəs, -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.
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.

Origin

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

Definition of pulvinus in:

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eat or drink (something) greedily