middle rib vs midvein

middle rib

noun
  • The main vein of a simple leaf or leaflet, running from the petiole to its apex, and from which the other veins usually spread. 

  • The continuation of the petiole of a pinnately compound leaf around which the leaflets attach. 

  • A cut of beef between the chuck rib and fore ribs. 

midvein

noun
  • The main vein of a simple leaf or leaflet, running from the petiole to its apex, and from which the other veins usually spread. 

How often have the words middle rib and midvein occurred in a corpus of books? (source: Google Ngram Viewer )