Home › Words › X › xylopalxylopalxylopal means A precious stone, petrified wood which has either developed an opalescent sheen or been completely replaced by opal.Among words judged in Lexicurio's Arena, xylopal ranks #2,165 of 42,747 for Qualifying.EtymologyXyl- + opalnounA precious stone, petrified wood which has either developed an opalescent sheen or been completely replaced by opal.Definitions & examples from Wiktionary (CC BY-SA 3.0).