noun (n)

• the middle area of the human torso (usually in front)(noun.body)

  Example:
  Young American women believe that a bare midriff is fashionable.
  

  Synonym:
  middle, midsection
  

  source: wordnet30
• (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration(noun.body)

  Synonym:
  diaphragm
  

  source: wordnet30
• See Diaphragm, n., 2.(noun)

  source: webster1913