Home › Words › R › ribstoneribstoneribstone means A petroglyph in the form of an animal's rib cage.Among words judged in Lexicurio's Arena, ribstone ranks #3,412 of 42,747 for Qualifying.EtymologyFrom rib + stone.nounA petroglyph in the form of an animal's rib cage.Definitions & examples from Wiktionary (CC BY-SA 3.0).