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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
pet•i•o•lule(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.