Pulvinus meaning

pŭl-vī'nəs, -vē'-
A cushionlike swelling at the base of the stalk of a leaf or leaflet.
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An enlarged area at the base of a petiole, at a node, or at the base of a panicled branch, producing movement by growth or swelling.
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(botany) A joint on a plant leaf or petiole that may swell and cause movement of the leaf or leaflet.
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Origin of pulvinus

Latin pulvīnus cushion