a partially or mostly burned piece of coal, wood, etc.

cinders,

any residue of combustion; ashes.

Geology . coarse scoriae erupted by volcanoes.

a live, flameless coal; ember.

Metallurgy .

slag ( def. 1 ) .

a mixture of ashes and slag.

to spread cinders on

The highway department salted and cindered the icy roads.

Archaic . to reduce to cinders.

to spread cinders on a surface, as a road or sidewalk

My neighbor began cindering as soon as the first snowflake fell.

noun

clinker , ember , hot coal , soot , ash , ashes , coal , dross , gray , scoria , slag