from The Century Dictionary.
- noun A cast-iron box riveted to the bottom of the extension front of a locomotive-boiler, to form an opening through which the cinders can be cleaned out.
Sorry, no etymologies found.
Out of a cinder-box which stood in the corner he had just left, he took some pieces of coal, found a splinter of resinous wood, went up into the barn, closed the door after him and struck a light.
Chapter III 1917