Definitions

1. noun

A coal or charcoal burner, especially one that produces smoke.

“The old koppers in the backyard was a major source of air pollution.”

2. noun

A type of carbonaceous residue resulting from the incomplete combustion of coal or other organic materials, often used in the manufacture of steel or as a soil amendment.

“The company used koppers to improve the quality of their steel products.”

3. noun

A type of carbonized material used as a fertilizer or soil amendment.

“The farmer applied koppers to his fields to increase crop yields.”