drupelet vs seed pit

drupelet

noun
  • One of the small drupe-like subdivisions which compose the outer layer of certain fruit such as blackberries or raspberries. 

seed pit

noun
  • A single seed in the center of a cherry, peach, plum, olive, avocado or other fruit. 

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