bookfell vs membrane

bookfell

noun
  • A skin prepared for writing upon; a sheet of vellum or parchment; paper. 

  • A vellum or parchment manuscript. 

membrane

noun
  • A piece of parchment forming part of a roll. 

  • A flexible or semiflexible covering or waterproofing whose primary function is to exclude water. 

  • A mechanical, thin, flat flexible part that can deform or vibrate when excited by an external force. 

  • A microscopic double layer of lipids and proteins forming the boundary of cells or organelles. 

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