IPA: /nɒn.kəmˈbʌs.tə.bəl/
KK: /nɑnˈkəmˌbʌstəbəl/
A material that does not catch fire easily or burn.
The building was constructed with noncombustible materials to ensure safety.
Noncombustible → It is formed from "non-" (meaning not) and "combustibilis" (from Latin, meaning able to burn). The word "noncombustible" means not able to burn or resistant to burning.
Think of 'not' ('non-') being combined with 'able to burn' ('combustibilis') — that's why noncombustible means something that cannot catch fire.