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 (pĕt′ē-ō-lo͞ol′, pĕt′ē-ōl′yo͞ol)
The stalk of a leaflet in a compound leaf.
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.


(Botany) the stalk of any of the leaflets making up a compound leaf
[C19: from New Latin petiolūlus, diminutive of Latin petiolus; see petiole]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈpɛt i əlˌyul, -əˌlul, ˌpɛt iˈɒl yul)

a small petiole, as of a leaflet in a compound leaf.
[1825–35; < New Latin petiolulus]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.petiolule - the stalk of a leaflet
stalk, stem - a slender or elongated structure that supports a plant or fungus or a plant part or plant organ
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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References in periodicals archive ?
Averages of dimension and lengths of leaflet's petiole and petiolule for at least 20 specimens were measured in cm.
petiolule and are less wide than the secondary veins.
There was a decrease in the length and width of the central leaflet, petiolule length, and number of teeth on the margin of the central leaflet in plants of the polluted habitats when compared with parallel measurements in plants of less polluted environments.
the lamina and the petiolule. The function and structure of this
Petiolule The stalk of a leaflet in a compound leaf; attaches to the rachis.
petiolule 0.5-2 cm long; segments (ultimate leaflets) 3-5, green and
The pequi has large leaves (20cm in length and 15cm wide) with petioles that may reach up to 15cm and petiolules that may reach up to 2cm (KUHLMANN, 2012).
pubescens is distinguished by its softly hairy rachis, leaves and petiolules. It is endemic to the Xishuangbanna region, China (Huang, 1997) and is known as Maqian in minority Dai area of China (Jia and Li, 2005; Li et al., 2014).
Some compound leaves have numerous leaflets, attached to a central rachis by petiolules. They may have an even or odd number of leaflets, and the leaflets may be arranged in a variety of ways (Fig.