[vee-ney-shuhn, vuh-]
the arrangement of veins, as in a leaf or in the wing of an insect.
these veins collectively.

1640–50; < Latin vēn(a) vein + -ation

venational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
venation (viːˈneɪʃən)
1.  the arrangement of the veins in a leaf or in the wing of an insect
2.  such veins collectively

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
venation   (vē-nā'shən)  Pronunciation Key 
  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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Example sentences
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
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