macerate vs μ-oxido dihydrogen

macerate

noun
  • A macerated substance. 

verb
  • To soften (something) or separate it into pieces by soaking it in a heated or unheated liquid. 

μ-oxido dihydrogen

noun
  • An alternative systematic name for water, H₂O. 

How often have the words macerate and μ-oxido dihydrogen occurred in a corpus of books? (source: Google Ngram Viewer )