[pet-ee-uhl-yool, -uh-lool, pet-ee-ol-yool]
noun Botany.
a small petiole, as of a leaflet in a compound leaf.

1825–35; < Neo-Latin petiolulus. See petiole, -ule

petiolular [pet-ee-ol-yuh-ler] , petiolulate [pet-ee-ol-yuh-leyt, -lit] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
petiolule (ˈpiːtɪəʊlˌjuːl)
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 & Unabridged 10th Edition
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