From Longman Dictionary of Contemporary Englishmidsectionmid‧sec‧tion /ˈmɪdˌsekʃən/ noun [countable usually singular] the middle part of something or of someone’s body There are 24 missiles in the submarine’s midsection.
Examples from the Corpus
midsection• Then again, Sargent might have tripped over his ample midsection, too.• He gives her another whack in the midsection with his elbow.• The midsection of the plane is broken nearly in two. 