Home › Words › R › rubstonerubstonerubstone means a whetstone (stone for scouring or rubbing).Among words judged in Lexicurio's Arena, rubstone ranks #2,165 of 42,747 for Qualifying.EtymologyFrom rub + stone.nouna whetstone (stone for scouring or rubbing).Definitions & examples from Wiktionary (CC BY-SA 3.0).