lavage vs permeate

lavage

noun
  • A washing of a hollow organ. 

  • A washing. 

verb
  • To wash a hollow organ 

permeate

noun
  • Liquid that has passed through a filtration system. 

  • A watery by-product of milk production. 

verb
  • To pass through the pores or interstices of; to penetrate and pass through without causing rupture or displacement; applied especially to fluids which pass through substances of loose texture 

  • To enter and spread through; to pervade. 

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