cuticula vs derm

cuticula

noun
  • A tough protective covering outside the epidermis of many invertebrates and plants; cuticle. 

derm

noun
  • The integument of animal; the skin. 

  • Synonym of dermis. 

  • Guts, entrails. 

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