noun-modifying (irregular)
splash-proof
Describes products or materials designed to resist splashing liquids, often used in technical or product descriptions.
This watch is splash-proof.
Mixed kana spelling; 沫 is a less common kanji, so this form may be used for readability.
Compound of 防 (ぼう, 'prevent') and 沫 (まつ, 'splash, foam').