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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 of pinnule
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. 2015.
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Examples from the Web for pinnule
Historical Examples
  • Sporangia in oblong sori under a reflexed tooth of a pinnule; indusium broad; rachis dark and shining.

    The Fern Lover's Companion George Henry Tilton
  • 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.

  • The 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 Bastin
  • The sori are placed on small veins which grow outwards from the midrib of the pinnule.

    How to Know the Ferns S. Leonard Bastin
  • They occur about midway between the central vein of the pinnule and the margin of the leaf.

    How to Know the Ferns S. Leonard Bastin
British Dictionary definitions for pinnule

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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pinnule 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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