pulvinus

[puhl-vahy-nuh s]
noun, plural pul·vi·ni [puhl-vahy-nahy] /pʌlˈvaɪ naɪ/.
  1. Botany. a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the axis.
  2. Architecture. pulvinar(def 2).

Origin of pulvinus

First recorded in 1855–60, pulvinus is from the Latin word pulvīnus cushion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for pulvinus

Historical Examples of pulvinus

  • Tropic response of pulvinus of Desmodium gyrans: Experiment 131.

  • In Mimosa, the responsive movement is brought about by a sudden diminution of turgor in the pulvinus.

    Life Movements in Plants

    Sir Jagadis Chunder Bose

  • This is accentuated by the expansion of the upper half of the pulvinus which is normally in a state of compression.

    Life Movements in Plants

    Sir Jagadis Chunder Bose

  • In Mimosa excitation is manifested by the contraction of the pulvinus and the consequent movement of the leaf.

    Life Movements in Plants

    Sir Jagadis Chunder Bose

  • The moto-excitability of the pulvinus of Mimosa is greatly modified under the influence of temperature.

    Life Movements in Plants

    Sir Jagadis Chunder Bose


British Dictionary definitions for pulvinus

pulvinus

noun plural -ni (-naɪ)
  1. a swelling at the base of a leafstalk: changes in its turgor pressure cause changes in the position of the leaf

Word Origin for pulvinus

C19: from Latin: cushion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012