Cinder

n.	1.	Partly burned or vitrified coal, or other combustible, in which fire is extinct.
	2.	A hot coal without flame; an ember.
	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.

Noun

1.

cinder - a fragment of incombustible matter left after a wood or coal or charcoal fire Synonyms: clinker

alluvion, alluvium, ash, ashes, brand, burning ember, calx, carbon, charcoal, clinker, coal, coke, coom, deposition, deposits, diluvium, draff, dregs, dross, ember, feces, firebrand, froth, fume, grounds, lava, lees, live coal, loess, moraine, offscum, precipitate, precipitation, reek, scoria, scum, sediment, settlings, silt, sinter, slag, smoke, smudge, smut, soot, sublimate, sullage