Source : Webster's Revised Unabridged Dictionary (1913)

Topgallant \Top`gal"lant\, a.
   1. (Naut.) Situated above the topmast and below the royal
      mast; designatb, or pertaining to, the third spars in
      order from the deck; as, the topgallant mast, yards,
      braces, and the like. See Illustration of {Ship}.

   2. Fig.: Highest; elevated; splendid. ``The consciences of
      topgallant sparks.'' --L'Estrange.

   {Topgallant breeze}, a breeze in which the topgallant sails
      may properly be carried.