n. A form of iron carbide, Fe3C, that is a component of steel
The Century Dictionary and Cyclopedia
n. A carbide of iron having the formula Fe3C.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a chemical compound that is a constituent of steel and cast iron; very hard and brittle
Word Usage
"When cooled slowly below 670 degrees, martensite yields a heterogeneous mixture of pearlite and ferrite (or cementite, if the original mixture contained between 0.8 per cent. and two per cent. of carbon)."