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From The Collaborative International Dictionary of English v.0.48:
Nervation \Ner*va"tion\ (n[~e]r*v[=a]"sh[u^]n), n. The arrangement of nerves and veins, especially those of leaves; neuration. [1913 Webster] 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. [1913 Webster]