sootproof
adjEtymology From soot + -proof.
1
Resistant to soot.
- A spark plug which will stay sootproof and give long service in any of the Ford cylinders, must be a specially built plug.1921, Chilton's Motor Age: Volume 39, Part 2, Chilton Company, page 128:
- […] only a sootproof plug is of any use to a Mathis owner.1914, The Autocar: Volume 33, London: Iliffe, Sons & Sturmey Limited, page 648: