Home › Words › S › subfluidsubfluidsubfluid means A substance that is partly fluid, or between solid and liquid.Among words judged in Lexicurio's Arena, subfluid ranks #7,193 of 42,747 for Qualifying.EtymologyFrom sub- + fluid.nounA substance that is partly fluid, or between solid and liquid.Definitions & examples from Wiktionary (CC BY-SA 3.0).