en- vs meso-

en-

prefix
  • an intensifier 

  • caused 

  • on, onto 

  • in, into 

  • covered 

meso-

prefix
  • intermediate 

  • middle-sized 

  • Used with words of Greek origin. 

  • Designating an achiral member of a group of diastereoisomers that has at least one chiral member 

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