stone

MATERIAL

A2the hard substance that is found in the ground and is often used for building

• The house is built of stone.
• There's an old stone wall around the field.

ROCK

B1a small piece of rock

• The children threw stones into the river.

SEED

B2the hard seed in the middle of some fruits

• Be careful, the cherries have stones in them.

JEWEL

B2a jewel

• The ring has a blue stone in the middle.