- a part or organ resembling a barb of a feather, a fin, or the like.
- a finlet.
Botany. a secondary pinna, one of the pinnately disposed divisions of a bipinnate leaf.
a metal plate with a small hole in it, used as a sight in a quadrant.
Origin of pinnule
1585–95;Related formspin·nu·lar [pin-yuh-ler] /ˈpɪn yə lər/, adjective
< Latin pinnula pinnula
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for pinnule
Historical Examples of pinnule
The index reference for "Pinnule" should probably be 59, rather than 66, but was not changed.
Pinnule, a secondary division of a bipinnate or tripinnate leaf, 66.
Sporangia in oblong sori under a reflexed tooth of a pinnule; indusium broad; rachis dark and shining.
The sori are placed on small veins which grow outwards from the midrib of the pinnule.
They occur about midway between the central vein of the pinnule and the margin of the leaf.
British Dictionary definitions for pinnule
noun plural pinnules or pinnulae (ˈpɪnjʊˌliː)
Derived Formspinnular, adjective
any of the lobes of a leaflet of a pinnate compound leaf, which is itself pinnately divided
zoology any feather-like part, such as any of the arms of a sea lily
Word Origin for pinnule
C16: from Latin pinnula, diminutive of pinna feather
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Any of the smaller leaflets into which each leaflet of a bipinnately compound leaf is subdivided. The leaves of many ferns are divided into pinnules.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.