black stone
General term for a stone that is black in color. Often contrasted with 白石 (white stone).
See also: 白石
I covered the garden with black stones.
black go stone; black (go pieces)
Specifically refers to the black stones used in the board game Go.
Place black and white stones alternately on the Go board.
Compound of 黒 (くろ, 'black') + 石 (いし, 'stone'). The reading くろいし is a straightforward kun'yomi combination.