As a Noun: 1. The hard substance which the earth is made of. It often sticks out of the ground or the sea. It is often used for building houses. English = stone, rock. 2. A hard substance such as iron, steel, copper, or lead. English = metal. 3. A hard dark metal found in rocks. English = iron. 4. A strong hard dark metal made from iron and carbon. English = steel. 5. A hard, rigid substance. 6. In golf, a club that has a head is made of metal rather than wood. English = iron. As a Verb or Adjective: 1. Of a thing, to be extremely hard or rigid. English = (be) rock hard. 2. To be made of metal; to look and sound like metal. English = (be) metallic. 3. Of ground, to be rough and to contain a lot of stones or rocks. English = stony, rocky.