n. (a) (Naut.) (1) A skysail of a triangular form. [ Rare ] (2) A name for the one of the fancy sails alleged to have been sometimes set above the skysail. [ Obs. ] (b) A very tall building, especially one over 20 stories high. (c) Hence, anything usually large, high, or excessive. [ Slang or Colloq. ] [ Webster 1913 Suppl. ]