noun, noun which may take the genitive case particle 'no'
fireproof; fire-resistant
Describes materials, structures, or equipment designed to withstand fire. Often used in compounds like 耐火構造 (fireproof construction) or 耐火金庫 (fireproof safe).
この建物は耐火構造になっている。
This building has a fireproof structure.
耐火金庫に重要書類を保管している。
I keep important documents in a fireproof safe.
Compound of 耐 (endure, withstand) and 火 (fire). The reading たいか is the on'yomi of both characters.