contraction [contractions]+(painful shortening of the uterine muscles)noun[UK: kən.ˈtræk.ʃn̩] [US: kən.ˈtræk.ʃn̩]
contraction [contractions]+(shortening of a muscle when it is used)noun[UK: kən.ˈtræk.ʃn̩] [US: kən.ˈtræk.ʃn̩]
↑