breech vs posterior

breech

noun
  • The external angle of knee timber, the inside of which is called the throat. 

  • The part of a cannon or other firearm behind the chamber. 

  • A breech birth. 

  • A garment whose purpose is to cover or clothe the buttocks. 

verb
  • To fit or furnish with a breech. 

  • To fasten with breeching. 

adj
  • Born, or having been born, breech. 

adv
  • With the hips coming out before the head. 

posterior

noun
  • The hinder parts of the body. 

  • The probability that a hypothesis is true (calculated by Bayes' theorem). 

adj
  • Following in order or in time. 

  • Next to, or facing the main stem or axis. 

  • Relating to or denoting presentation of a fetus in which the rear or caudal end is nearest the cervix and emerges first at birth. 

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