noun
black stone
General term for a stone that is black in color. Often contrasted with 白石 (white stone).
See also: 白石
庭に黒石を敷き詰めた。
I covered the garden with black stones.
noun
black go stone; black (go pieces)
Specifically refers to the black stones used in the board game Go.
碁盤の上に黒石と白石を交互に置く。
Place black and white stones alternately on the Go board.