middle rib

Noun

 * 1) A cut of beef between the chuck rib and fore ribs.
 * 2)  The main vein of a simple leaf or leaflet, running from the petiole to its apex, and from which the other veins usually spread.
 * 3)  The continuation of the petiole of a pinnately compound leaf around which the leaflets attach.
 * 1)  The continuation of the petiole of a pinnately compound leaf around which the leaflets attach.