Noun
A continuation of the petiole, extending from the base to the apex of the lamina of a leaf.
Source: Webster's dictionaryBlades oriented for the thrust have thicker blades, sometimes with a distinct midrib for increased stiffness, with a strong taper and an acute point. Source: Internet
Pereskia species have "normal" leaves, with a midrib and a flattened blade (lamina) on either side. Source: Internet
The petioles and leaves are removed and harvested; celery is packed by size and quality (determined by colour, shape, straightness and thickness of petiole, stalk and midrib length and absence of disease, cracks, splits, insect damage and rot). Source: Internet
One early silver dagger was recovered with midrib design. Source: Internet
Spines may be present on the midrib of leaflets and the rachis of compound leaves. Source: Internet
This means that on its way from the midrib of the leaflet to the point of the serration, the vein serving the tip of the serration passes close by the intervening notch. Source: Internet