amianthus vs asbestos

amianthus

noun
  • A type of asbestos with long, soft, thin fibers. 

asbestos

noun
  • Any of asbestos-like forms of several minerals, asbestiforms 

  • Any of several fibrous mineral forms of magnesium silicate, used for fireproofing, electrical insulation, building materials, brake linings, chemical filters, suits, fireman's gloves, etc. 

verb
  • To insulate or buffer. 

  • To coat or line with asbestos. 

  • To expose to asbestos; to cause to suffer asbestosis. 

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