ash
n. C / U C1 Advanced Oxford US //ˈæʃ// UK //ˈæʃ// ash
n. the soft, grey powder that remains after something has been completely burned by fire.
n. the powdery residue left after the combustion of a substance.
The cigarette ash fell onto the carpet.
After the campfire died down, only a pile of grey ash remained in the stone pit.
Volcanic ash can remain suspended in the atmosphere for months, reflecting sunlight and potentially causing a temporary drop in global temperatures.
Usage
Uncountable when referring to the substance in general; countable when referring to the remains of a specific person or a specific type of residue.