- vein, nervure - any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ
--1 is a kind of vascular bundle, vascular strand, fibrovascular bundle
--1 has particulars: midrib, midvein - vein, nervure - one of the horny ribs that stiffen and support the wing of an insect
--2 is a kind of rib