pinnule
Zoology.
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
1Other words from pinnule
- pin·nu·lar [pin-yuh-ler], /ˈpɪn yə lər/, adjective
Words Nearby pinnule
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use pinnule in a sentence
Each pinnule has its edges so much recurved that the whole forms a sort of pouch, apparently filled with sporangia.
Beautiful Ferns | Daniel Cady EatonThey occur about midway between the central vein of the pinnule and the margin of the leaf.
How to Know the Ferns | S. Leonard BastinThe sori are in the form of lines which branch out from the lower part of the pinnule in a fan-shaped manner.
How to Know the Ferns | S. Leonard BastinThe sori are placed on small veins which grow outwards from the midrib of the pinnule.
How to Know the Ferns | S. Leonard BastinSporangia in oblong sori under a reflexed tooth of a pinnule; indusium broad; rachis dark and shining.
The Fern Lover's Companion | George Henry Tilton
British Dictionary definitions for pinnule
pinnula (ˈpɪnjʊlə)
/ (ˈpɪnjuːl) /
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
Origin of pinnule
1Derived forms of pinnule
- pinnular, adjective
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
Scientific definitions for pinnule
[ pĭn′yōōl ]
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.
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