fireproof
adjective/ˈfaɪərpruːf/
Frequency rank: #15,999 most common English word
Meaning
resistant to or protected from damage by fire.

Example sentence
The engineers built the storage room to be fireproof so that important documents would survive any blaze.
Synonyms & related words
- flame-resistant
- fire-resistant
- incombustible
- nonflammable
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