Home › Words › W › watermosswatermosswatermoss means A fern of the genus Salvinia.Among words judged in Lexicurio's Arena, watermoss ranks #16,730 of 42,747 for Qualifying.EtymologyFrom water + moss.nounA fern of the genus Salvinia.Definitions & examples from Wiktionary (CC BY-SA 3.0).