amnion vs coat

amnion

noun
  • The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended. 

coat

noun
  • The fur or feathers covering an animal's skin.ᵂᵖ 

  • Canvas painted with thick tar and secured round a mast or bowsprit to prevent water running down the sides into the hold (now made of rubber or leather). 

  • A covering of material, such as paint.ᵂᵖ 

  • A coat of arms.ᵂᵖ 

  • An outer garment covering the upper torso and arms.ᵂᵖ 

  • The habit or vesture of an order of men, indicating the order or office; cloth. 

  • A coat card. 

verb
  • To cover like a coat. 

  • To cover with a coating of some material. 

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