Home › Words › O › outershelloutershelloutershell means A protective cover or layer (especially referring to an item of clothing).Among words judged in Lexicurio's Arena, outershell ranks #12,999 of 42,749 for Qualifying.EtymologyCompound of outer + shell.nounA protective cover or layer (especially referring to an item of clothing).e.g.“Try trimming extra clothing by using layers of polypropylene clothing and waterproof outershells.” — 1993, Jeff Bennett, Rafting!: The Complete Guide to Whitewater Rafting Techniques and Equipment, Portland, O.R.: Swiftwater Publishing Company, →ISBN, page 201:Definitions & examples from Wiktionary (CC BY-SA 3.0).