cinder

Definitions:

Anything that remains after being subjected to combustion; a piece of coal that has ceased to flame or burn; the refuse of burnt coal or wood.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (noun) (n.) (noun)
A thoroughly charred piece of wood or other combustible substance; slag from a metal furnace; an ember.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
Any body or piece of matter thoroughly burnt, but not reduced to ashes- thus the refuse of a fire consists of ashes and cinders.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)
Cindery.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adjective) (adj.) (adjective)
Refuse of burnt coal.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (noun) (n.) (noun)

Usage examples:

Forests were scorched to a cinder
- The Book of the National Parks by Robert Sterling Yard
When the cinder skeleton of the final sheet had been crushed into ashes, he rose from his knees and reached for his hat.
- The Honorable Senator Sage-Brush by Francis Lynde
He spoke first of the new cinder track and straight- away, from which he lightly and gracefully went on to congratulating the team on having so much good material this year- though he saw fewer there to- night than he had expected.
- The Whirligig of Time by Wayland Wells Williams