the arrangement of veins, as in a leaf or in the wing of an insect.
these veins collectively.
- ve·na·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use venation in a sentence
The venation is peculiar, and the disposition of the sori depends mainly on the peculiarities of the venation.Beautiful Ferns | Daniel Cady Eaton
The fibro-vascular system in the leaf constitutes the venation.
The venation of the wings of insects is another example of modifications without serving any special purpose.Darwin, and After Darwin, Volume II (of 3) | George John Romanes
The compound leaves correspond to these modes of venation; they are either pinnately or palmately compound.Outlines of Lessons in Botany, Part I; From Seed to Leaf | Jane H. Newell
The thorax bears the two rather broad, membranous wings (Fig. 42) which have characteristic venation.Insects and Diseases | Rennie W. Doane
British Dictionary definitions for venation
the arrangement of the veins in a leaf or in the wing of an insect
such veins collectively
- 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
Scientific definitions for venation
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.
The veins of such a system considered as a group.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.