petiole vs veinlet

petiole

noun
  • The stalk of a leaf, attaching the blade to the stem. 

  • A narrow or constricted segment of the body of an insect; especially, the metasomal segment of certain Hymenoptera, such as wasps. 

  • The stalk at the base of the nest of the paper wasp. 

veinlet

noun
  • A small or secondary vein, especially on the wing of an insect or the leaf of a plant. 

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