A stone is a natural material made from minerals. It can be found on the ground or in water, and it is often used in building.
I found a stone on the ground.
She skipped a stone on the lake.
In the UK, 'stone' is a way to measure weight. One stone is 14 pounds, and it is often used to describe people's weight.
She weighs ten stone.
He lost three stone this year.
In some games, a special stone is used to play. It can be rolled, thrown, or placed in specific ways during the game.
He rolled the stone in the game.
The kids played with a stone on the field.