ve·na·tion

[vee-ney-shuhn, vuh-]
noun
1.
the arrangement of veins, as in a leaf or in the wing of an insect.
2.
these veins collectively.
Origin:
1640–50; < Latin vēn(a) vein + -ation

Related forms
ve·na·tion·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
venation (viːˈneɪʃən) [Click for IPA pronunciation guide]
 
—n
1.  the arrangement of the veins in a leaf or in the wing of an insect
2.  such veins collectively
 
ve'national
 
—adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Venation is always a great word to know.
So is interrobang. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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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
Upper surfaces pink to green to brown, often marbled in darker brown or
  patterned with prominent venation.
Although adults have two pairs of wings with reduced venation, they are weak
  fliers.
Wing venation patterns are characteristic for identification to family.
The two pairs of wings have reduced venation and are covered with white powdery
  wax.
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