• (n.) The arrangement or distribution of nerves, as in the leaves of a plant or the wings of an insect; nervation. • (n.) The arrangement or distribution of nerves, as in the leaves of a plant or the wings of an insect; nervation.
Neu·ra'tion noun (Biol.) The arrangement or distribution of nerves, as in the leaves of a plant or the wings of an insect; nervation. 
venation, as of an insect's wings.