also: おおいし
noun
large stone; boulder
General term for a big rock or boulder. Can be used in everyday contexts.
庭に大石を置いて飾りにした。
I placed a large stone in the garden as a decoration.
川のそばに大きな大石が転がっている。
A big boulder is lying by the river.
noun
dragon (go); large connected group of stones
Go term: a long, connected group of stones that spans a wide area, often hard to capture.
相手の大石を攻めるのがこの局面の鍵だ。
Attacking the opponent's dragon is the key to this position.
Compound of 大 (large) and 石 (stone). The reading たいせき is the on'yomi, while おおいし is the kun'yomi. The go sense is a specialized extension of the literal meaning.