noun
Mythological ruler of dragons, often appearing in East Asian folklore and fantasy. Also used as a title in shogi for the promoted rook.
竜王は海の底に住むと伝えられている。
The Dragon King is said to live at the bottom of the sea.
noun
promoted rook
Shogi piece: a rook that has been promoted, gaining the ability to move one square diagonally in addition to its original moves.
See also: 飛車 (ひしゃ)
飛車が成ると竜王になる。
When a rook promotes, it becomes a Dragon King.