A spark plug which will stay sootproof and give long service in any of the Ford cylinders, must be a specially built plug.
Source: wiktionary
Sootproof
Synonyms for "sootproof"
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Sample sentences
2 total sentences available.
[…] only a sootproof plug is of any use to a Mathis owner.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.