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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
1855-60; < Latin pulvīnus cushion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for pulvinus
Historical Examples
  • Light was applied in all cases on upper half of pulvinus of terminal leaflet of Desmodium gyrans.

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

  • Electric shock passes instantaneously through the mass of the pulvinus, stirring up the active tissues to responsive contraction.

    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
  • In condition of sub-tonicity the pulvinus of Mimosa responds to stimulus by an abnormal positive or erectile 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
  • 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
  • Light is shown to exert a direct stimulating action on the pulvinus, independent of photo-synthesis.

    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
  • Examples of this are furnished by the cardiac muscle of the animal, the pulvinus of Mimosa, and the stamen of Berberis.

    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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