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