(dk, dyk) noun
1. An English temporal peer of the highest rank, yielding precedence to a prince of the blood or an archbishop, and ranking above a marquis or a bishop.
2. A Continental noble or prince of corresponding rank.
3. A reigning prince of less importance than a king ruling over a duchy or a small state.
4. Formerly, a powerful semi–independent vassal.
—v.i. duked, duk·ing To play the duke. [<F duc <L dux leader]

(dk, dyk), Benjamin Newton,
1855–1929, and his brother James Buchanan,
1856–1925, U.S. tobacco magnates.