pulvinus

Noun. (botany) A joint on a plant leaf or petiole that may swell and cause movement of the leaf or leaflet.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.