midriff
definition: a muscular partition separating the abdominal and thoracic cavities
example: The school dress code stated that showing your midriff was unacceptable.
speech part: noun
synonyms:
diaphragm
definition: the middle area of the human torso (usually in front)
example: young American women believe that a bare midriff is fashionable
speech part: noun
synonyms:
middle