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A pattern of veins or nerves; venation.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(nɜːˈveɪʃən) or


(Biology) a less common word for venation
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(viˈneɪ ʃən, və-)

1. the arrangement of veins, as in a leaf or in the wing of an insect.
2. these veins collectively.
[1640–50; < Latin vēn(a) vein + -ation]
ve•na′tion•al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
The petiole is smooth and the leaves are opposite needles, having a parallel nervation.
In his abbreviated description of laboriosa, de Saussure (1854:171) compared to minutissima de Saussure, described immediately before, writing "Taille, forme et nervation comme dans la precedente espece, mais la tete et le corselet sans rugosites." Ducke (1910: 470), in his key, separated minutissima (Spinola), laboriosa and sedula (=exigua as already noted) in one triplet.