Botany. a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the axis.
Architecture. pulvinar (def. 2).
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How to use pulvinus in a sentence
The specimen employed was a terminal leaflet of Desmodium gyrans (Fig. 122) the pulvinus of which is very sensitive to light.
Effect of increasing intensity of light on the pulvinus of Desmodium gyrans: Experiment 129.
Before describing the experiment I shall demonstrate the tropic reactions of the two halves of the pulvinus of Mimosa.
A series of such positive responses of the upper half of the pulvinus is given in figure 118.
The velocity of transmission of excitation in a transverse direction through the pulvinus is about 0·011 mm.
British Dictionary definitions for pulvinus
a swelling at the base of a leafstalk: changes in its turgor pressure cause changes in the position of the leaf
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