Definition of "waist"

waist

/weɪst/

noun
plural waists
1. (anatomy) The part of the body between the pelvis and the stomach.
2. A part of a piece of clothing that covers the waist.
3. The narrow connection between the thorax and abdomen in certain insects (e.g., bees, ants and wasps).
4. The middle portion of the hull of a ship or the fuselage of an aircraft.
5. (nautical) That part of the upper deck of a ship between the quarterdeck and the forecastle.
  Quotations
  There he stood, very quietly overlooking some sailmakers who were mending a top-sail in the waist.
  1851 November 14, Herman Melville, “chapter 18”, in Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley
6. The middle part of anything.
  Quotations
  In the dead vast and middle of the night
  c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene ii]