Meaning of pulvinus

pul•vi•nus

Pronunciation: (pul-vī'nus), [key]
— pl. -ni
  1. a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the axis.
  2. pulvinar (def. 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.