pulvinus

[ puhl-vahy-nuhs ]

noun

, plural pul·vi·ni [puhl-, vahy, -nahy].

1. Botany. a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the axis.
2. Architecture. pulvinar ( def 2 ).

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.

From Time

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.

From Time

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

From Project Gutenberg

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.

From Project Gutenberg

After a few additional days the ill-defined zone of cells becomes distinct, and although it does not extend across the whole width of the petiole, and although the cells are of a green colour from containing chlorophyll, yet they certainly constitute a pulvinus, which as we shall presently see, acts as one.

From Project Gutenberg