dewlap vs thorax

dewlap

noun
  • The pendulous skin under the neck of an ox, or a similar feature on any other animal. 

  • The sagging flesh on the throat of an elderly human. 

thorax

noun
  • The region of the mammalian body between the neck and abdomen as well as the cavity containing the heart and lungs. 

  • The middle of three distinct divisions in an insect, crustacean or arachnid body to which the legs are attached. 

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