1) Fibrovascular bundle 2) French word used in English 3) Leaf ridge 4) Vascular bundle 5) Vascular strand 6) Vein 1) Midrib 2) Midvein 
Older term for vein. adnervural is used to describe for instance lines running adjacent and alongside the veins.
vein of a leaf
• (n.) One of the chitinous supports, or veins, in the wings of incests. • (n.) One of the nerves of leaves. • (n.) One of the chitinous supports, or veins, in the wings of incests. • (n.) One of the nerves of leaves.
Nerv'ure noun [ French See Nerve .] 1. (Botany) One of the nerves of leaves. 2. (Zoology) One of the chitinous supports, or veins, in the wings of incests. 
a vein, as of a leaf or the wing of an insect.