Weatherproof/ˈweðərpruːf/ Definition 1 of 2Pro Tip 1/3Usage in Products Often used to describe items designed for outdoor use that can withstand natural elements. My weatherproof jacket kept me dry during the storm. Pro Tip 2/3Marketing Appeal Companies use 'weatherproof' to emphasize durability and protection for marketing. The weatherproof smartphone can survive being submerged in water. Pro Tip 3/3Collocation Variation ‘Weatherproof’ can pair with diverse nouns related to outdoor or harsh weather conditions. Make sure to buy weatherproof boots for the hiking trip.