pulvinus

[ puhl-vahy-nuh s ]
/ pʌlˈvaɪ nəs /
|

noun, plural pul·vi·ni [puhl-vahy-nahy] /pʌlˈvaɪ naɪ/.

Botany. a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the axis.
Architecture. pulvinar(def 2).

Origin of pulvinus

First recorded in 1855–60, pulvinus is from the Latin word pulvīnus cushion
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British Dictionary definitions for pulvinus

pulvinus

/ (pʌlˈvaɪnəs) /

noun plural -ni (-naɪ)

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