cinders

/S IH1 N D ER0 Z/
noun
  1. 1

    Partially or mostly burnt material that results from incomplete combustion of coal or wood etc.

  2. 2

    An ember.

  3. 3

    Slag from a metal furnace.

  4. 4

    Any strong stimulant added to tea, soda water, etc.

Source: https://en.wiktionary.org/wiki/cinder, https://en.wiktionary.org/wiki/cinders