decoct vs retard

decoct

verb
  • To reduce or diminish. 

  • To heat as if by boiling. 

  • To make an infusion. 

  • To digest in the stomach. 

  • To devise. 

  • To reduce, or concentrate by boiling down. 

retard

verb
  • To decelerate; to slow down. 

  • To put off; to postpone. 

  • To keep delaying; to continue to hinder; to prevent from progressing. 

noun
  • Retardation; delay. 

  • A slowing down of the tempo; a ritardando. 

  • A person or being who is extremely stupid or slow to learn. 

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