The Collaborative International Dictionary of English v.0.48:

Venation \Ve*na"tion\, n. [L. vena a vein.]
   The arrangement or system of veins, as in the wing of an
   insect, or in the leaves of a plant. See Illust. in Appendix.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Venation \Ve*na"tion\, n. [L. venatio, fr. venari, p. p.
   venatus, to hunt. See Venison.]
   The act or art of hunting, or the state of being hunted.
   [Obs.] --Sir T. Browne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

venation
    n 1: (botany) the arrangement of veins in a leaf
    2: (zoology) the system of venous blood vessels in an animal
       [syn: venation, venous blood system]