adenoid vs third tonsil

adenoid

noun
  • an abnormally enlarged mass of lymphatic tissue at the back of the pharynx, often obstructing the nasal and ear passages and hindering speaking and breathing in young children. 

  • Such a mass when not abnormally enlarged, covered by ciliated epithelium and located in the roof and posterior wall of the nasopharynx at the back of the throat behind the uvula. 

adj
  • Of or relating to lymphatic glands or lymphoid tissue. 

  • Of or pertaining to the adenoids. 

  • Relating to, affected with, or associated with abnormally enlarged adenoids. 

third tonsil

noun
  • Synonym of adenoid. 

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