Source : Webster's Revised Unabridged Dictionary (1913)

Farewell \Fare"well`\, a.
   Parting; valedictory; final; as, a farewell discourse; his
   farewell bow.

         Leans in his spear to take his farewell view.
                                                  --Tickell.

   {Farewell rock} (Mining), the Millstone grit; -- so called
      because no coal is found worth working below this stratum.
      It is used for hearths of furnaces, having power to resist
      intense heat. --Ure.