1. a black powdery substance produced by the incomplete burning of coal, wood, oil, or other fuel

Examples

• The chimney was clogged with soot from years of use.
• Black soot covered the walls after the house fire.
• She cleaned the soot from the fireplace with a brush.
• The old coal stove left soot marks on the ceiling.
• Soot particles can be harmful if inhaled regularly.
• The mechanic’s hands were covered in soot from the engine.