corium vs hangnail

corium

noun
  • The layer of skin between the epidermis and the subcutaneous tissues; the dermis. 

  • A lavalike mixture of fissile material created in a nuclear reactor's core during a nuclear meltdown. 

  • Armour made of leather, particularly that used by the Romans. 

  • The deep layer of mucous membranes beneath the epithelium. 

hangnail

noun
  • A loose, narrow strip of nail tissue protruding from the side edge and anchored near the base of a fingernail or toenail. 

  • A pointed upper corner of the toenail (often created by improperly trimming by rounding the corner) that, as the nail grows, presses into the flesh or protrudes so that it may catch (“hang”) on stockings or shoes. 

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