Cinder

Part of speech: noun (n.)

1. Partly burned or vitrified coal, or other combustible, in which fire is extinct.

2. A hot coal without flame; an ember. Swift.

3. A scale thrown off in forging metal.

4. The slag of a furnace, or scoriaceous lava from a volcano. Cinder frame, a framework of wire in front of the tubes of a locomotive, to arrest the escape of cinders. -- Cinder notch (Metal.), the opening in a blast furnace, through which melted cinder flows out.