pulvinus noun. [pʌl'vʌɪnǝs] Pl. -ni [-nʌɪ]. M19.
[Latin = cushion, pillow.]
Botany. Any cushion-like swelling; esp. a special enlargement at the base of a petiole or petiolule in some plants, which is subject to changes of turgor leading to nastic movements of the leaf or leaflet.

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