Home › Words › S › scumboardscumboardscumboard · noun — A partition in a sewage tank etc. to block the passage of floating solids.Definition from Wiktionary (CC BY-SA 3.0).Among words judged in Lexicurio's Arena, scumboard ranks #23,653 of 42,898 for Qualifying.EtymologyFrom scum + board.nounA partition in a sewage tank etc. to block the passage of floating solids.Definitions & examples from Wiktionary (CC BY-SA 3.0).