impermeable vs sorbefacient

impermeable

adj

  • Impossible to permeate. 

  • Not allowing passage, especially of liquids; waterproof. 

sorbefacient

adj

  • Producing absorption. 

noun

  • A medicine or substance that produces absorption. 

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