Home › Words › S › sourgrasssourgrasssourgrass · noun — sorrel; of genus Oxalis.Definition from Wiktionary (CC BY-SA 3.0).Among words judged in Lexicurio's Arena, sourgrass ranks #9,792 of 42,862 for Qualifying.EtymologyFrom sour + grass.nounSorrel; of genus Oxalis.Sorrel; of species Rumex acetosellaA crabgrass of species Digitaria insularisDefinitions & examples from Wiktionary (CC BY-SA 3.0).