pulvinus

[puhl-vahy-nuhs]

noun

plural

pulvini 

1. Botany.,  a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the axis.

2. Architecture.,  pulvinar.

pulvinus

/ pʌlˈvaɪnəs /

noun

1. a swelling at the base of a leafstalk: changes in its turgor pressure cause changes in the position of the leaf

Word History and Origins

Origin of pulvinus¹

First recorded in 1855–60, pulvinus is from the Latin word pulvīnus cushion

Word History and Origins

Origin of pulvinus¹

C19: from Latin: cushion

Example Sentences

What makes the sunflower such a puzzle is that it belongs to a group of flowers that lack what is known as a pulvinus—a thickening at the base of a leaf or other structure that changes its rigidity in response to light.

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As the sun moves across the sky, different amounts of water flow into different parts of the pulvinus, nudging the leaf in the sunniest direction.

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The pulvinus of this capital is ornamented with leaves, as 263 in the example from Athens in B�tticher's Tektonik, pl.

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It was not a column, it was a pulvinus, or volute, of a colossal marble altar, worthy of being compared, in size and perfection of work, with the Altar of Peace discovered under the Palazzo Fiano, with that of the Antonines discovered under the Monte Citorio, and with other such monumental structures.

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They are articulated to the petiole, and the petiole to the branch by a pulvinus.

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