ectoderm vs leather

ectoderm

noun
  • Outermost of the three tissue layers in the embryo of a metazoan animal. Through development, it will produce the epidermis (skin) and nervous system of the adult. 

leather

noun
  • A tough material produced from the skin of animals, by tanning or similar process, used e.g. for clothing. 

  • A punch. 

  • A piece of the above used for polishing. 

  • A cricket ball or football. 

  • A good defensive play 

  • clothing made from the skin of animals, often worn by motorcycle riders. 

adj
  • Made of leather. 

  • Referring to one who wears leather clothing (motorcycle jacket, chaps over 501 jeans, boots), especially as a sign of sadomasochistic homosexuality. 

verb
  • To cover with leather. 

  • To spank or beat with a leather belt or strap. 

  • To strike forcefully. 

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