The Collaborative International Dictionary of English v.0.48:

Noah's ark \No"ah's ark\, prop. n.
   The ship built by Noah according to God's command, as related
   in the bible.
   [PJC]

   2. (Zool.) A marine bivalve shell (Arca Noae), which
      somewhat resembles an ark, or ship, in form.
      [1913 Webster]

   3. A child's toy, consisting of an ark-shaped box containing
      many different wooden animals.
      [1913 Webster]

   4. (Fig.) Anything having a wide and representative
      assortment of people or objects of a particular class; as,
      the bar scene in Star Wars was a Noah's Ark of almost
      every imaginable alien form..
      [PJC]