Refers to the burnt remains after something has burned, such as charcoal, wood, or paper. Often used for the glowing remnants of a fire.
Clean up the cinders from the campfire.
The embers in the stove are still glowing red.
Common mixed kanji-kana spelling; the kanji 燃え clarifies the meaning 'burning' while かす is often written in kana.
Full kanji spelling using the uncommon character 滓; rarely used in modern writing.
Compound of 燃え (もえ, the continuative form of 燃える 'to burn') and かす (滓, 'dregs, lees, scum'). The spelling 燃えかす is a common mixed kanji-kana form.