from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A pattern of veins or nerves; venation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A pattern of nerves, e.g. as seen on a leaf.
from the GNU version of the Collaborative International Dictionary of English
- n. The arrangement of nerves and veins, especially those of leaves; neuration.
from The Century Dictionary and Cyclopedia
- n. The arrangement or distribution of nerves.
Ultimately from Latin nervus ("nerve, sinew"), perhaps via French nervation. (Wiktionary)