Definition of waist

• n. - That part of the human body which is immediately below the ribs or thorax; the small part of the body between the thorax and hips.
• n. - Hence, the middle part of other bodies; especially (Naut.), that part of a vessel's deck, bulwarks, etc., which is between the quarter-deck and the forecastle; the middle part of the ship.
• n. - A garment, or part of a garment, which covers the body from the neck or shoulders to the waist line.
• n. - A girdle or belt for the waist.