waist

Short definition from Wiktionary

Noun

1. 1
   The part of the body between the pelvis and the stomach.
2. 2
   A part of a piece of clothing that covers the waist.
3. 3
   The narrow connection between the thorax and abdomen in certain insects (e.g., bees, ants and wasps).
4. 4
   The middle portion of the hull of a ship or the fuselage of an aircraft.
5. 5
   That part of the upper deck of a ship between the quarterdeck and the forecastle.
6. 6
   The middle part of anything.