cinder UK /ˈsɪndəː/US /ˈsɪndɚ/noun 4verb 2forms 3 noun4 •Partially or mostly burnt material that results from incomplete combustion of coal or wood etc.; it often rides the rising smoke column into the air, and it can pose a fire hazard when it lands, in dry conditions. •An ember.If from adown the hopeful chops The fat upon the cinder drops, To stinking smoke it turns the flame, Poisoning the flesh from whence it came — 1730 •Slag from a metal furnace. •(informal, old-fashioned) Any strong stimulant added to tea, soda water, etc.Oh, horrid proposition! One would imagine, Tom, that you had been a coal-heaver. Had you said soda and cinder, I would have seconded the motion. — 1846 verb2 •To reduce to cinders. •To cover with cinders.We plan to cinder this path. formscindered · cindering · cinders