| 1. | a mass of incombustible matter fused together, as in the burning of coal. |
| 2. | a hard Dutch brick, used esp. for paving. |
| 3. | a partially vitrified mass of brick. |
| 4. | the scale of oxide formed on iron during forging. |
| 5. | Geology. a mass of vitrified material ejected from a volcano. |
| 6. | to form clinkers in burning. |

clinker
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