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pulvinus

[puhl-vahy-nuh s] /pʌlˈvaɪ nəs/
noun, plural pulvini
[puhl-vahy-nahy] /pʌlˈvaɪ naɪ/ (Show IPA)
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
1855-1860
First recorded in 1855-60, pulvinus is from the Latin word pulvīnus cushion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for pulvinus
Historical Examples
  • 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
  • The upper part of the pulvinus is thus seen practically to have little influence in hastening the fall.

    Life Movements in Plants Sir Jagadis Chunder Bose
  • Normal records, were taken after long-continued application of water on the pulvinus.

    Life Movements in Plants Sir Jagadis Chunder Bose
  • The result is seen in the above record (Fig. 19), where water was applied on the pulvinus after the second response.

    Life Movements in Plants Sir Jagadis Chunder Bose
  • This experiment proves conclusively that light has a direct stimulating action on the pulvinus, independent of photo-synthesis.

    Life Movements in Plants Sir Jagadis Chunder Bose
  • Light is shown to exert a direct stimulating action on the pulvinus, independent of photo-synthesis.

    Life Movements in Plants Sir Jagadis Chunder Bose
British Dictionary definitions for pulvinus

pulvinus

/pʌlˈvaɪnəs/
noun (pl) -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
C19: from Latin: cushion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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13
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