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.