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venation

[vee-ney-shuh n, vuh-] /viˈneɪ ʃən, və-/
noun
1.
the arrangement of veins, as in a leaf or in the wing of an insect.
2.
these veins collectively.
Origin
1640-1650
1640-50; < Latin vēn(a) vein + -ation
Related forms
venational, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for venation
  • Wing venation patterns are characteristic for identification to family.
  • Damage from hungry insects, cold weather or parasites can interrupt leaves' normal venation patterns.
  • Parallel venation has several large veins connected by many smaller ones.
  • Although adults have two pairs of wings with reduced venation, they are weak fliers.
  • Wildflowers are forbs, plants that have net venation in their leaves and no woody base, or branches.
  • The two pairs of wings have reduced venation and are covered with white powdery wax.
  • Upper surfaces pink to green to brown, often marbled in darker brown or patterned with prominent venation.
British Dictionary definitions for venation

venation

/viːˈneɪʃən/
noun
1.
the arrangement of the veins in a leaf or in the wing of an insect
2.
such veins collectively
Derived Forms
venational, 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
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Word Origin and History for venation
n.

1640s, of plant structures, noun of state from Latin vena "vein" (see vein).

Online Etymology Dictionary, © 2010 Douglas Harper
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venation in Science
venation
  (vē-nā'shən)   
  1. The distribution or arrangement of a system of veins, as in an insect's wing or a leaf blade. Patterns of venation in insect wings are often used to identify and differentiate species. In angiosperm plants, the venation of eudicot and magnoliid leaves is generally netted or reticulate, with smaller veins branching out from larger ones in a pinnate or palmate pattern, while that of monocots is parallel, with many veins of similar size running parallel to each other along the length of the plant part. These parallel veins are connected to each other by much smaller cross veins.

  2. The veins of such a system considered as a group.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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