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pinnule

[pin-yool] /ˈpɪn yul/
noun
1.
Zoology.
  1. a part or organ resembling a barb of a feather, a fin, or the like.
  2. a finlet.
2.
Botany. a secondary pinna, one of the pinnately disposed divisions of a bipinnate leaf.
3.
a metal plate with a small hole in it, used as a sight in a quadrant.
Origin
1585-1595
1585-95; < Latin pinnula pinnula
Related forms
pinnular
[pin-yuh-ler] /ˈpɪn yə lər/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pinnular

pinnule

/ˈpɪnjuːl/
noun (pl) pinnules, pinnulae (ˈpɪnjʊˌliː)
1.
any of the lobes of a leaflet of a pinnate compound leaf, which is itself pinnately divided
2.
(zoology) any feather-like part, such as any of the arms of a sea lily
Derived Forms
pinnular, adjective
Word Origin
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
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pinnular in Science
pinnule
  (pĭn'yl)   
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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