also: ぼうかびざい
noun
anti-mold agent; mildew-proofing agent
A substance used to prevent mold or mildew growth, often in building materials, paints, or household products.
この塗料には防カビ剤が含まれています。
This paint contains an anti-mold agent.
浴室のカビを防ぐために防カビ剤を使った。
I used a mildew-proofing agent to prevent mold in the bathroom.
Compound of 防 (ぼう, 'prevent') + カビ ('mold') + 剤 (ざい, 'agent').