Nervation
Pronunciation : Ner*va"tion
Part of Speech : n.
Definition : Defn: The arrangement of nerves and veins, especially those of leaves; neuration. The outlines of the fronds of ferns, and their nervation, are frail characters if employed alone for the determination of existing genera. J. D. Hooker.
Source : Webster's Unabridged Dictionary, 1913