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 (pŭl-vī′nəs, -vē′-)
n. pl. pul·vi·ni (-nī′)
A cushionlike swelling at the base of the stalk of a leaf or leaflet.

[Latin pulvīnus, cushion.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -ni (-naɪ)
(Botany) a swelling at the base of a leafstalk: changes in its turgor pressure cause changes in the position of the leaf
[C19: from Latin: cushion]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(pʌlˈvaɪ nəs)

n., pl. -ni (-nī).
a cushionlike swelling at the base of a leaf or leaflet, at the point of junction with the stem.
[1855–60; < Latin pulvīnus cushion]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Preantennal Region: Head more or less triangular; anterior margin tapered; hyaline margin developed, marginal carina unbroken medially and highly translucent in the mid-anterior part; clypeal suture developed, not touches premarginal carina; ventral preantennal setae (pas) conspicuously long and fine in two pairs; preantennal nodus very short; conus sharply pointed, more or less equal to scape in length; ventral anterior plate present; pulvinus divided, not surrounded by pulvinal band; torma absent.
Leaves alternate, spiral or distichous; petiolate or subsessile, presence of pulvinus; extrafloral nectaries absent or present, convex, sessile or stipitate, located between the pairs of leaflets or on the petiole; leaflets 1-many pairs, papyraceous to coriaceous, elliptic to oblong, lanceolate to obovate, apex acuminate, rounded to mucronate, base oblique.
l., formerly grouped together in Mariscus, have spikelets with an adaxial swelling body (pulvinus) at the prophyll base.
Uncus bifurcated at base, 1/2 times as long as tegument, each fork medium-long, slender at apex, broad at base; tegumen wide and arc-shaped, socii broad and wide, incurved at apex and strongly setose, shorter than uncus; gnathos degenerated; 1 pulvinus between tegument and valva, finger-shaped protuberance at pulvini; valva clavate, wide and thick at base; cucullus thin and long, strongly sclerotized; juxta similar triangle-shaped; saccus medium-long and thin.
Abstract: Some plant species both track and avoid the sun through turgor changes of the pulvinus tissue at the base of their leaves, maximizing light reception in dim conditions and minimizing cellular damage due to excessive light.
Table (2) shows that Bombax ceiba is morphologically distinct from Ceiba pentanda and Ceiba speciosa in thorn shape & color, trunk developed with butteresses, tree branching type, large pulvinus, petiole length (14.5cm), leaflet petiolule length (2.6cm), leaflet blade length (11cm)& width (4.8cm) where Bombax ceiba has the highest values, the number, shape and apex of the leaflet and different flowering seasons.
Development of crosses and generations: From 2000-2002, Early Premium, as female parent, was crossed with known genes carrier lines (male parent), the seed was sown 5-7 cm with next leaf (called pulvinus), appears and the ear length is about 4-5 cm, this stage is called cell meiosis.
The mean number of lerps were as follows: on veins (13 [+ or -] 10.87), between veins (2.7 [+ or -] 3.78), along leaf margins (0.87 [+ or -] 1.18), pulvinus (0.47 [+ or -] 0.78), and petioles (0.33 [+ or -] 0.96) (Fig.
EHD needs to be considered in the differential diagnosis of cattle with clinical signs that include fever; stomatitis; lameness; salivation; redness and scaling of the nose and lips; swelling of the tongue; and erosions of the pulvinus dentalis, palatinum, and nose.
"Ionic column: a fluted column with a molded base and a capital composed of four volutes, usually parallel to the architrave with a pulvinus connecting a pair on each side of the column, and an entablature typically consisting of an architrave of three fascias, a richly ornamented frieze, and a cornice corbeled out on egg-and-dart and dentil moldings, with the frieze sometimes omitted."
Six tropical dry forest tree species (four with pulvinii and two without) were studied at the Area de Conservacion Guanacaste in Costa Rica to determine the role of the pulvinus organ in heat retention and herbivory.