Waterproof

Part of speech: adjective, verb

Definitions

1. Resistant to water intrusion, allowing for effective use in varied conditions while safeguarding items and structures from damage caused by moisture
2. Engineered to block the entry of water, ensuring that both functionality and longevity remain intact when in contact with wet environments
3. Designed to prevent water from penetrating surfaces or materials, thus protecting items from moisture-related harm while maintaining their intended purpose and durability

Etymology: "Waterproof" is a plain compound: "water" plus the suffix "-proof," which means resistant to or impervious to the thing named before it. The "-proof" element itself came into English as a noun and adjective meaning a proof or test, as in "proof" against something, so a waterproof material is one that has been tested and held out a particular threat. The same pattern produced "fireproof" and "bulletproof." English is not alone in building the word this way. West Frisian has "wetterproef" and Dutch has "waterproef," both formed from the same elements, which suggests the compound arose in parallel across closely related languages rather than being passed from one to another. The Dutch and West Frisian forms share the root and sense, so the word reflects a common Germanic pattern of combining a substance with a resistance suffix.

Synonyms: impermeable, water-resistant, sealed, watertight, moisture-proof

Antonyms: permeable, absorbent, non-waterproof, leaky, vulnerable