Fireproof/ˈfaɪərpruːf/ Definition 1 of 2Pro Tip 1/3Safety Features Fireproof in contexts often relates to safety measures and construction standards. The new school is equipped with fireproof doors. Pro Tip 2/3Describing Materials Use 'fireproof' to describe materials that can resist flames, typically in construction or clothing. Firefighters wear fireproof suits. Pro Tip 3/3False Security Fireproof doesn't mean indestructible; items can still be damaged by heat or smoke. The fireproof vault was heat-damaged but intact.